Dell OptiPlex 755 User's Guide
Dell OptiPlex 755 Manual
 |
View all Dell OptiPlex 755 manuals
Add to My Manuals
Save this manual to your list of manuals |
Dell OptiPlex 755 manual content summary:
- Dell OptiPlex 755 | User's Guide - Page 1
Dell™ OptiPlex™ 755 User's Guide Models: DCTR, DCNE, DCSM, and DCCY www.dell.com | support.dell.com - Dell OptiPlex 755 | User's Guide - Page 2
this text: Dell, the DELL logo, OptiPlex, TravelLite, OpenManage, and StrikeZone are trademarks of Dell Inc.; Intel, SpeedStep, and Celeron are registered trademarks and Core and vPro are trademarks of Intel Corporation in the U.S and other countries; Microsoft, MS-DOS, Windows, Windows Vista, and - Dell OptiPlex 755 | User's Guide - Page 3
Intrusion Detector 31 System Board Components 32 4 Mini Tower Computer Specifications Cards 41 Installing a PCI or PCI Express Card 41 Removing a PCI or PCI Express Card 45 PS/2 Serial Port Adapter 47 Installing a PS/2 Serial Port Adapter 47 Removing a PS/2 Serial Port Adapter 49 Installing - Dell OptiPlex 755 | User's Guide - Page 4
the Media Card Reader 67 Optical Drive 69 Removing an Optical Drive 69 Installing an Optical Drive 70 Processor 73 Removing the Processor 73 Installing the Processor 74 I/O Panel 77 Removing the I/O Panel 77 Replacing the I/O Panel 78 Power Supply 79 Replacing the Power Supply 79 DC - Dell OptiPlex 755 | User's Guide - Page 5
System Board Components 95 6 Desktop Computer Specifications Cards 103 PCI Cards 103 Installing a PCI Card 103 Removing a PCI Card 109 Installing a PCI Card in the Riser-Card Cage 111 Removing a PCI Card From the Riser-Card Cage 114 PS/2 Serial Port Adapter 116 Installing a PS/2 Serial Port - Dell OptiPlex 755 | User's Guide - Page 6
a Media Card Reader 139 Hard Drive 142 Removing a Hard Drive 142 Installing a Hard Drive 143 Replacing a Second Hard Drive 146 Processor 149 Removing the Processor 149 Installing the Processor 150 I/O Panel 153 Removing the I/O Panel 153 Replacing the I/O Panel 154 Power Supply 155 - Dell OptiPlex 755 | User's Guide - Page 7
Board Components 172 Small Form Factor Computer Specifications 175 Cards 181 PCI Cards 181 Installing a PCI Card 181 Removing a PCI Card 184 PCI Express and DVI Cards 185 Installing a PCI Express x16 Card or DVI Card 186 Removing a PCI Express x16 Card or DVI Card 189 PS/2 Serial Port - Dell OptiPlex 755 | User's Guide - Page 8
Power Supply 219 Replacing the Power Supply 219 DC Power Connectors 221 DC Power Connector P1 221 DC Power Connector P2 223 DC Power Connectors P3 223 DC Power Connector P5 224 DC Power Connector P6 224 Speakers 225 Installing a Speaker 225 Removing a Speaker 225 8 Ultra Small Form Factor - Dell OptiPlex 755 | User's Guide - Page 9
the Chassis Intrusion Detector 235 System Board Components 236 Cable Cover (Optional 237 Attaching the Cable Cover 237 Removing the Cable Cover 237 Connecting the AC Power Adapter 238 Dell Badge 239 Ultra Small Form Factor Computer Specifications 241 Drives 247 General Installation - Dell OptiPlex 755 | User's Guide - Page 10
271 Alert Standard Format 272 Dell OpenManage™ Applications 272 Dell Client Manager (DCM 273 Dell Client Manager (DCM) Console Security Management Software 276 Computer Tracking Software 276 About Smart Cards and Fingerprint Readers 276 Password Protection 277 System Password 277 - Dell OptiPlex 755 | User's Guide - Page 11
for the Current Boot 287 Changing Boot Sequence for Future Boots 288 Booting to a USB Device 288 Memory Key 288 Floppy Drive 289 Jumper Settings 289 Clearing Forgotten Passwords 290 Clearing CMOS Settings 291 Hyperthreading and Multi-Core Technology 292 Power Management for Windows XP and - Dell OptiPlex 755 | User's Guide - Page 12
a RAID Level 1 Configuration 301 10 Battery Replacing the Battery 303 11 Replacing the System Board Removing the System Board: Mini Tower, Desktop, Small Form Factor, and Ultra Small Form Factor Computers 307 Mini Tower System Board Screws 308 Desktop System Board Screws 309 Small Form Factor - Dell OptiPlex 755 | User's Guide - Page 13
328 Network Setup 328 Windows XP 328 Windows Vista 329 17 Troubleshooting Battery Problems 331 Card Problems 331 Drive Problems 332 Optical drive problems 333 Problems writing to an optical drive 333 Hard drive problems 333 E-Mail, Modem, and Internet Problems 334 Error Messages 335 - Dell OptiPlex 755 | User's Guide - Page 14
Video and Monitor Problems 343 The screen is blank 343 The screen is difficult to read 343 3D image quality is poor 344 Power Lights 344 System Lights 345 Diagnostic Lights 347 Beep Codes 350 System Messages 351 Dell Diagnostics 353 When to Use the Dell Diagnostics 353 Starting the Dell - Dell OptiPlex 755 | User's Guide - Page 15
What Is a Driver 356 Identifying Drivers 356 Microsoft® Windows® XP 357 Microsoft Windows Vista 357 Reinstalling Drivers and Utilities 357 Using Windows Device Driver Rollback 357 Manually Reinstalling Drivers 358 Troubleshooting Software and Hardware Problems in the Microsoft® Windows® XP - Dell OptiPlex 755 | User's Guide - Page 16
19 Warranty 20 FCC Notices (U.S. Only) FCC Class B 373 Glossary 375 16 Contents - Dell OptiPlex 755 | User's Guide - Page 17
or experienced users. • How to set up my computer • Basic troubleshooting information • How to run the Dell Diagnostics • Tools and utilities NOTE: Drivers and documentation updates can be found at support.dell.com. Quick Reference Guide NOTE: This document may be optional and may not ship with - Dell OptiPlex 755 | User's Guide - Page 18
settings • How to troubleshoot and solve problems • Service Tag and Express Service Code • Microsoft Windows License Label Find It Here Dell™ Product Information Guide Dell™ OptiPlex™ User's Guide Microsoft Windows Help and Support Center 1 Click Start or → Help and Support→ Dell User and System - Dell OptiPlex 755 | User's Guide - Page 19
for your computer, you should also reinstall the DSS utility. DSS provides critical updates To download Desktop System Software: 1 Go to support.dell.com, select your region or business segment, and enter your Service Tag. 2 Select Drivers & Downloads and click Go. for your operating system and - Dell OptiPlex 755 | User's Guide - Page 20
reinstall your operating system, use the Operating System media. See "Reinstalling Windows XP or Windows Vista" on page 363. After you reinstall your operating system, use the Drivers and Utilities media to reinstall drivers for the devices that came with your computer. Your operating system product - Dell OptiPlex 755 | User's Guide - Page 21
in your Dell™ Product Information Guide. • A component can be replaced by performing the removal procedure in reverse order. Recommended Tools The procedures in this document may require the following tools: • Small flat-blade screwdriver • Phillips screwdriver • Flash BIOS update program floppy - Dell OptiPlex 755 | User's Guide - Page 22
outlet before removing the cover. 5 Remove the computer cover. • For a mini tower computer, see "Removing the Computer Cover" on page 27. • For a desktop computer, see "Removing the Computer Cover" on page 90. • For a small form factor computer, see "Removing the Computer Cover" on page 168. • For - Dell OptiPlex 755 | User's Guide - Page 23
Mini Tower Computer About Your Mini Tower Computer Front View 1 2 3 11 4 10 5 6 9 7 8 23 Mini Tower Computer - Dell OptiPlex 755 | User's Guide - Page 24
wake device in the Windows Device Manager. For more information about sleep modes and power-saving mode, see "Advanced Features" on page 269. See "Diagnostic Lights" on page 347 for a description of light codes that can help you troubleshoot problems with your computer. This light flickers when the - Dell OptiPlex 755 | User's Guide - Page 25
closely matches the AC power available in your location. NOTICE: In Japan, the voltage selection switch must be set to the 115-V position. Also, ensure that your monitor and attached devices are electrically rated to operate with the AC power available in your location. 25 Mini Tower Computer - Dell OptiPlex 755 | User's Guide - Page 26
card slots (4) Insert the power cable. Plug serial, USB, and other devices into the appropriate connectors. See "Back Panel Connectors" on page 26. Access connectors for any installed PCI or PCI Express cards computer is not detecting a physical connection to the network. 26 Mini Tower Computer - Dell OptiPlex 755 | User's Guide - Page 27
light Flashes a yellow light 8 video connector card. Do not remove the cap. NOTE: If you are using a graphics card that supports dual monitors, use the y-cable that came with your computer. 9 serial connector Connect a serial device, such as a handheld device, to the serial port Mini Tower Computer - Dell OptiPlex 755 | User's Guide - Page 28
aside on a soft nonabrasive surface. CAUTION: Graphics card heat sinks can become very hot during normal operation. Ensure that a graphics card heat sink has had sufficient time to cool before you touch it. 1 2 3 1 security cable slot 2 cover release latch 3 padlock ring 28 Mini Tower Computer - Dell OptiPlex 755 | User's Guide - Page 29
any of the procedures in this section, follow the safety instructions located in the Product Information Guide. NOTE: The chassis intrusion switch is standard on the ultra small form factor computer but is optional on mini tower, desktop and small form factor computers; it may not be present on your - Dell OptiPlex 755 | User's Guide - Page 30
Cover" on page 27). 3 Disconnect the chassis intrusion switch cable from the system board by using two fingers to squeeze the release mechanism on one side of the connector to the system board. 3 Replace the computer cover (see "Replacing the Computer Cover" on page 317). 30 Mini Tower Computer - Dell OptiPlex 755 | User's Guide - Page 31
When the blue DELL™ logo appears, press immediately. If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft® Windows® desktop. Then shut down default setting is On-Silent. 4 Save your BIOS settings and exit system setup. Mini Tower Computer 31 - Dell OptiPlex 755 | User's Guide - Page 32
power connector (12VPOWER) 5 memory module connectors (DIMM_1, DIMM_2, DIMM_3, DIMM_4) 11 10 9 12 RTC reset jumper (RTCRST) 13 intrusion switch connector (INTRUDER) 14 battery socket (BATTERY) 15 PCI Express x16 connector (SLOT1) 16 PCI Express x1 connector (SLOT4) 32 Mini Tower Computer - Dell OptiPlex 755 | User's Guide - Page 33
18 PCI connector (SLOT3) SATA3) 8 front-panel connector (FRONTPANEL) 19 serial connector (SERIAL2) 9 power connector (POWER) 20 system board speaker (BEEP) 10 external SATA connector (eSATA) 21 aux power LED (aux_LED) 11 internal USB (INT_USB) 22 floppy connector (DSKT) Mini Tower Computer - Dell OptiPlex 755 | User's Guide - Page 34
34 Mini Tower Computer - Dell OptiPlex 755 | User's Guide - Page 35
Mini Tower Computer Specifications Microprocessor Microprocessor type Internal cache Memory Type Memory connectors Memory modules supported Minimum memory Maximum memory BIOS address Computer Information Chipset Data bus width Address bus width DMA channels Interrupt levels BIOS chip (NVRAM) NIC - Dell OptiPlex 755 | User's Guide - Page 36
PCI Express x1: 5 Gbps SATA: 1.5 Gbps and 3.0 Gbps USB: 480 Mbps full-height cards supported two two 164 pin connectors 32 bits one x1 and one x16 10 W (x1) and 75 W (x16) maximum 36 pins (x1) and 164 pins (x16) one PCI Express lane (x1) and 16 PCI Express lanes (x16) 36 Mini Tower Specifications - Dell OptiPlex 755 | User's Guide - Page 37
Video Network adapter Optional PS/2 with secondary serial port adapter USB Audio System board connectors: SATA eSATA Floppy drive Serial Fan PCI 2.2 PCI Express Front panel 9-pin connector; 16550C-compatible 25-pin connector (bidirectional) 15-pin VGA connector RJ45 connector two 6-pin mini - Dell OptiPlex 755 | User's Guide - Page 38
yellow blinking light adapter) Diagnostic lights four lights on the front panel (See "Diagnostic Lights" on page 347.) Standby power light AUX_PWR on the system board Power DC power supply: Wattage Heat dissipation Voltage Backup battery NOTE: Power consumption from an AC power source can - Dell OptiPlex 755 | User's Guide - Page 39
3048 m (-50 to 10,000 ft) -15.2 to 10,668 m (-50 to 35,000 ft) G2 or lower as defined by ISA-S71.04-1985 Mini Tower Specifications 39 - Dell OptiPlex 755 | User's Guide - Page 40
40 Mini Tower Specifications - Dell OptiPlex 755 | User's Guide - Page 41
2 securing tab (only for PCI Express cards) 3 PCI Express x16 card slot 4 PCI Express x1 card 5 PCI Express x1 card slot Installing a PCI or PCI Express Card NOTE: Your Dell computer uses only PCI and PCI Express slots. NOTE: The serial port adapter for your mini tower computer includes two PS - Dell OptiPlex 755 | User's Guide - Page 42
a card, uninstall the driver for the existing card. See the documentation that came with the card for instructions. 1 card retention latch 4 card-edge connector 2 alignment guide 5 card connector 3 card 6 release tab 4 If you are installing a new card, remove the filler bracket to create a card - Dell OptiPlex 755 | User's Guide - Page 43
is aligned with the securing tab, and gently pull the securing tab. 3 2 1 4 5 1 PCI Express x16 card 4 securing tab 2 lever 5 PCI Express x16 card connector 3 securing slot (not all cards) 9 Place the card in the connector and press down firmly. Ensure that the card is fully seated in the slot - Dell OptiPlex 755 | User's Guide - Page 44
notch in the top of the card or filler bracket fits around the alignment guide. 11 Secure the card(s) by closing the card retention latch and snapping it into place. NOTICE: Do not route card cables over or behind the cards. Cables routed over the cards can prevent the computer cover from closing - Dell OptiPlex 755 | User's Guide - Page 45
on page 280). b Connect external audio devices to the sound card's connectors. Do not connect external audio devices to the microphone, speaker/headphone . 16 Install any drivers required for the card as described in the card documentation. Removing a PCI or PCI Express Card 1 Follow the procedures - Dell OptiPlex 755 | User's Guide - Page 46
computer and devices to electrical outlets, and then turn them on. 7 Uninstall the card's driver. See the documentation that came with the card for instructions. 8 If you removed a sound card: a Enter system setup, select Audio Controller, and change the setting to On (see "System Setup" on page 280 - Dell OptiPlex 755 | User's Guide - Page 47
network connector on the back panel of the computer. PS/2 Serial Port Adapter CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide. NOTICE: To prevent static damage to components inside your computer, discharge - Dell OptiPlex 755 | User's Guide - Page 48
not route cables over any installed cards. Cables routed over the cards can prevent the computer cover from closing properly or cause damage to the equipment. 7 Connect the adapter cable to the serial port adapter connector (SERIAL2) on the system board (see "System Board Components" on page 32 for - Dell OptiPlex 755 | User's Guide - Page 49
adapter for information about the cable connections. 8 Replace the computer cover (see "Replacing the Computer Cover" on page 317). Removing a PS/2 Serial Port Adapter 1 Follow the procedures in "Before You Begin" on page 21. 2 Remove the computer cover (see "Removing the Computer Cover" on page - Dell OptiPlex 755 | User's Guide - Page 50
2 1 1 card retention latch 2 alignment guide 4 Disconnect the PS/2 serial adapter cable from the system board (see "System Board Components" on page 32). 5 If necessary, disconnect any external cables connected to the adapter. 6 Ease the PS/2 serial-port adapter bracket out of its retention slot. - Dell OptiPlex 755 | User's Guide - Page 51
your computer also supports hot-plugging. Hot-plugging allows for device detection without powering down your powered down before removal and/or replacement. CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide - Dell OptiPlex 755 | User's Guide - Page 52
4 Plug the free end of the eSATA cable into the eSATA connector on the system board. 5 Replace the computer cover (see "Replacing the Computer Cover" on page 317). 6 Boot your computer and enter system setup (see "Entering System Setup" on page 280). Use the esata option to enable the esata drive. - Dell OptiPlex 755 | User's Guide - Page 53
supports: • Two SATA (Serial ATA) hard drives • One 3.5-inch floppy drive or media card reader • Two SATA optical drives • One eSATA drive (with optional bracket) 2 1 3 1 optical drive 2 3.5-inch drive or media card Board Components" on page 32 for the location of SATA connectors on the system - Dell OptiPlex 755 | User's Guide - Page 54
you install a drive, you connect two cables-a DC power cable and a data interface cable-to the back of the drive. Data Interface Connectors SATA Connector 1 2 1 data interface cable connector 2 data interface connector Power Cable Connectors 1 2 1 power cable 2 power input connector 54 Drives - Dell OptiPlex 755 | User's Guide - Page 55
begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. CAUTION: To guard against electrical shock, always unplug your computer (see "Removing the Computer Cover" on page 27). 5 Disconnect the power and data cables from the drive. Drives 55 - Dell OptiPlex 755 | User's Guide - Page 56
1 2 3 1 data cable 2 hard drive system board connector 3 power cable 6 Press in on the blue release tabs on each side of the drive and slide the drive up and out of the computer. 56 Drives - Dell OptiPlex 755 | User's Guide - Page 57
2 1 1 hard drive 2 release tabs (2) Installing a Hard Drive 1 Unpack the replacement hard drive, and prepare it for installation. 2 Check the documentation for the drive to verify that it is configured for your computer. 3 If your replacement hard drive does not have the plastic hard drive - Dell OptiPlex 755 | User's Guide - Page 58
1 2 1 hard drive 4 Snap the bracket onto the new drive. 2 hard drive bracket 1 2 3 1 hard drive 2 hard drive bracket 3 pins 58 Drives - Dell OptiPlex 755 | User's Guide - Page 59
and update the SATA port option under the Drives option list. 12 Exit system setup, and reboot the computer. 13 Partition and logically format your drive. See the documentation for your operating system for instructions. 14 Test the hard drive by running the Dell Diagnostics (see "Dell Diagnostics - Dell OptiPlex 755 | User's Guide - Page 60
drive, insert a bootable medium into your boot drive. See the documentation that came with the drive for instructions on installing any software required for drive procedures in this section, follow the safety instructions in the Product Information Guide. CAUTION: To guard against electrical shock, - Dell OptiPlex 755 | User's Guide - Page 61
1 2 3 1 hard drive 2 hard drive bracket 3 pins 6 Carefully slide the new hard drive into the bay until it clicks into place. 7 Connect the power cable to the drive. Drives 61 - Dell OptiPlex 755 | User's Guide - Page 62
8 Locate an unused SATA connector on the system board and attach a data cable to this connector and to the second hard drive. 62 Drives - Dell OptiPlex 755 | User's Guide - Page 63
and update the SATA port option under the Drives option list. 11 Exit system setup, and reboot the computer. 12 Partition and logically format your drive. See the documentation for your operating system for instructions. 13 Test the hard drive by running the Dell Diagnostics (see "Dell Diagnostics - Dell OptiPlex 755 | User's Guide - Page 64
Removing the Floppy Drive 1 Boot your computer and enter system setup (see release latch downward to open the panel, and then remove it from the hinges. 5 Disconnect the power and data cables from the back of the floppy drive. 2 1 1 floppy drive 2 drive release screws to the new drive. 64 Drives - Dell OptiPlex 755 | User's Guide - Page 65
the shoulder screw slots, and gently slide it into the bay until it clicks into place. 3 2 1 1 floppy drive 2 shoulder screws (4) 3 shoulder screw slots (2) 4 Attach the power and data cables to the floppy drive and to the system board. Drives 65 - Dell OptiPlex 755 | User's Guide - Page 66
1 2 3 1 data cable 2 power cable 3 floppy drive connector (DSKT) 5 Replace the Dell Diagnostics (see "Dell Diagnostics" on page 353). Media Card Reader CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide - Dell OptiPlex 755 | User's Guide - Page 67
the floppy before installing the media card reader. Boot your computer and enter system setup (see "Entering System Setup" on page 280). Use the Diskette Drive option to disable the floppy drive. Follow instructions in "Removing the Floppy Drive" on page 64. 2 If you are installing a new media - Dell OptiPlex 755 | User's Guide - Page 68
the shoulder screws on the media card reader with the shoulder screw slots, and gently slide it into the bay until it clicks into place. 3 2 1 1 media card reader 2 shoulder screws (4) 3 shoulder screw slots (2) 4 Attach the cable to the media card reader and to the system board. 68 Drives - Dell OptiPlex 755 | User's Guide - Page 69
that your computer works correctly by running the Dell Diagnostics (see "Dell Diagnostics" on page 353). Optical Drive CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide. CAUTION: To guard against electrical shock - Dell OptiPlex 755 | User's Guide - Page 70
2 1 1 optical drive 2 drive release latch Installing an Optical Drive 1 Follow the procedures in "Before You Begin" on page 21. 2 Remove the computer cover (see "Removing the Computer Cover" on page 27). 3 If you are replacing an optical drive, remove the shoulder screws from the existing drive - Dell OptiPlex 755 | User's Guide - Page 71
5 Check the documentation that accompanied the drive to verify that the drive is configured for your computer. 6 Align the shoulder screws on the optical drive with the shoulder screw slots, and slide the drive into the bay until it clicks into place. 2 1 3 1 optical drive 2 shoulder screws (3) - Dell OptiPlex 755 | User's Guide - Page 72
computer. 1 2 3 1 power cable 2 data cable 3 SATA optical drive connector 8 Check all cable connections, and fold cables out of the way to provide airflow for the fan and cooling vents. 9 Replace the computer cover (see "Replacing the Computer Cover" on page 317). 10 Update your configuration - Dell OptiPlex 755 | User's Guide - Page 73
procedures in this section, follow the safety instructions located in the Product Information Guide. NOTICE: To prevent static damage to be very hot during normal operation. Be sure that it has had sufficient time to cool before you touch it. 4 Rotate the heat sink assembly upward, and remove it - Dell OptiPlex 755 | User's Guide - Page 74
NOTICE: Unless a new heat sink is required for the new processor, reuse the original heat sink assembly when you replace the processor. 5 Open the processor cover by sliding the release lever from under the center cover latch on the socket. Then, pull the lever back to release the processor. NOTICE: - Dell OptiPlex 755 | User's Guide - Page 75
, ensure that the processor aligns properly with the socket, and do not use excessive force when you install the processor. 7 Set the processor lightly in the socket and ensure that the processor is positioned correctly. 8 When the processor is fully seated in the socket, close the processor cover - Dell OptiPlex 755 | User's Guide - Page 76
9 Pivot the socket release lever back toward the socket, and snap it into place to secure the processor. 10 Clean the thermal grease from the bottom of the heat sink. NOTICE: Ensure that you apply new thermal grease. New thermal grease is critical for ensuring adequate thermal bonding, which is a - Dell OptiPlex 755 | User's Guide - Page 77
procedures in this section, follow the safety instructions located in the Product Information Guide. CAUTION: To guard against electrical shock, the screw that secures the I/O panel. Press the release button to slide the card away from the front of the computer. 4 Disconnect all of the cables from - Dell OptiPlex 755 | User's Guide - Page 78
I/O panel 2 securing screw 4 I/O cable connector Replacing the I/O Panel 1 To replace the I/O panel, follow the removal procedure in the reverse order. NOTE: Use the guides on the I/O panel bracket to help position the I/O panel in place, and use the notch on the I/O panel bracket to help seat the - Dell OptiPlex 755 | User's Guide - Page 79
Power Supply Replacing the Power Supply CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide Disconnect the DC power cables from the system board and the drives. Note the routing of the DC power cables underneath the - Dell OptiPlex 755 | User's Guide - Page 80
button 3 screws (4) 2 power supply 4 AC power connector 6 Slide the power supply toward the front of the computer by approximately 1 inch. 7 Lift the power supply up and out of the computer. 8 Slide the replacement power supply into place. 9 Replace the screws that secure the power supply to the - Dell OptiPlex 755 | User's Guide - Page 81
DC Power Connectors DC Power Connector P1 13 14 15 16 17 18 19 20 21 22 23 24 1 2 3 4 5 6 7 8 9 10 11 12 Pin Number 1 2 3 Signal name +3.3 VDC +3.3 VDC GND 18-AWG Wire Orange Orange Black Power Supply 81 - Dell OptiPlex 755 | User's Guide - Page 82
+5 VDC +5 VDC 18-AWG Wire Red Black Red Black Gray Purple White White Orange Orange Blue Black Green Black Black Black NC Red Red 82 Power Supply - Dell OptiPlex 755 | User's Guide - Page 83
P2 3 4 Pin Number Signal Name 18-AWG Wire 1 2 1 GND Black 2 GND Black 3 +12 VADC Yellow 4 +12 VADC Yellow DC Power Connectors P3, P5, P8, and P9 Pin Number Signal name 18-AWG Wire 1 +3.3 VDC Orange 2 GND Black 3 +5 VDC Red 4 GND Black 5 +12 VBDC White Power Supply 83 - Dell OptiPlex 755 | User's Guide - Page 84
DC Power Connector P7 4 321 Pin Number Signal Name 22-AWG Wire 1 +5 VDC Red 2 GND Black 3 GND Black 4 +12 VDC Yellow DC Power Connector P10 Pin Number Signal name 18-AWG Wire 1 +12 VBDC White 2 GND Black 3 GND Black 4 +5 VDC Red 84 Power Supply - Dell OptiPlex 755 | User's Guide - Page 85
of the procedures in this section, follow the safety instructions located in the Product Information Guide. NOTICE: To prevent static damage to components inside your the computer. 4 Connect the cables to the system board. 5 Replace the computer cover. 6 Turn on power to the computer. Speakers 85 - Dell OptiPlex 755 | User's Guide - Page 86
of the procedures in this section, follow the safety instructions located in the Product Information Guide. NOTICE: To prevent static damage to components inside 27). 3 Disconnect the cables from the system board. 4 Remove the speaker from the chassis of the computer. 5 Replace the computer cover. 6 - Dell OptiPlex 755 | User's Guide - Page 87
back USB connectors for devices that typically remain connected, such as printers and keyboards. 2 LAN indicator light This light indicates that a LAN (local area network) connection is established. 3 power button Press this button to turn on the computer. NOTICE: To avoid losing data, do not - Dell OptiPlex 755 | User's Guide - Page 88
, see "Power Management for Windows XP and Windows Vista" on page 292. See "Diagnostic Lights" on page 347 for a description of light codes that can help you troubleshoot problems with your computer. Use the lights to help you troubleshoot a computer problem based on the diagnostic code. For more - Dell OptiPlex 755 | User's Guide - Page 89
manual voltage selection switch. To help avoid damaging a computer with a manual voltage selection switch, set the switch for the voltage that most closely matches the AC power parallel connector 2 link integrity light 5 6 8 7 Connect an installed card containing a parallel Desktop Computer 89 - Dell OptiPlex 755 | User's Guide - Page 90
activity light Flashes a yellow light when 8 video connector card. Do not remove the cap. NOTE: If you are using a graphics card that supports dual monitors, use the y-cable that came with your computer. 9 serial connector Connect a serial device, such as a handheld device, to the serial port - Dell OptiPlex 755 | User's Guide - Page 91
card heat sink has had sufficient time to cool before you touch it. 1 2 3 1 security cable slot 2 cover release latch 3 padlock ring Inside Your Computer CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. CAUTION - Dell OptiPlex 755 | User's Guide - Page 92
board Chassis Intrusion Switch CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide. NOTE: The chassis intrusion switch is standard on the ultra small form factor computer but is optional on mini tower, desktop - Dell OptiPlex 755 | User's Guide - Page 93
snaps securely into place. 2 Reconnect the cable to the system board. 3 Replace the computer cover (see "Replacing the Computer Cover DELL™ logo appears, press immediately. If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft® Windows® desktop - Dell OptiPlex 755 | User's Guide - Page 94
or Disabled. NOTE: The default setting is On-Silent. 4 Save your BIOS settings and exit system setup. Removing the Heat Sink Assembly 1 Loosen the captive hot during normal operation. Be sure that it has had sufficient time to cool before you touch it. 2 Rotate the heat sink assembly upward, and - Dell OptiPlex 755 | User's Guide - Page 95
System Board Components 1 2 22 21 20 19 18 17 16 15 14 3 4 5 6 7 13 12 11 10 9 8 Desktop Computer 95 - Dell OptiPlex 755 | User's Guide - Page 96
) 13 battery socket (BATTERY) 14 PCI Express x16 connector (SLOT1) 15 PCI connector (SLOT2) 16 PCI connector (SLOT3) 17 riser connector (uses PCI-E port/SLOT1 and PCI port/SLOT2) 18 serial connector (SERIAL2) 19 system board speaker (BEEP) 20 aux power LED (aux_LED) 21 floppy connector (DSKT) 22 fan - Dell OptiPlex 755 | User's Guide - Page 97
Desktop Computer Specifications Microprocessor Microprocessor type Internal cache Memory Type Memory connectors Memory modules supported Minimum memory Maximum memory BIOS address Computer Information Chipset Data bus width Address bus width DMA channels Interrupt levels BIOS chip (NVRAM) NIC The - Dell OptiPlex 755 | User's Guide - Page 98
: without riser-card cage connectors card size power • Intel Graphics Media Accelerator 3100 (integrated on system board) • PCI Express x16 slot can support either a PCI Express graphics card or a DVI graphics card (for dual-monitor support) ADI 1984 High Definition Audio 24-bit analog-to-digital - Dell OptiPlex 755 | User's Guide - Page 99
) PCI only: with optional, full-height PCI riser-card cage, supporting both low-profile and full-height cards connectors three PCI card size one low-profile card and two full-height cards connector size 120 pins connector data width (maximum) 32 bits eSATA Desktop Computer Specifications - Dell OptiPlex 755 | User's Guide - Page 100
reader (in 3.5-inch drive bay) Floppy drive 34-pin connector Serial 12-pin connector for optional secondary PS/2 serial port card Fan 5-pin connector PCI Express one 120-pin (x16) connector PCI 2.3 two 120-pin connectors Front panel 40-pin connector 100 Desktop Computer Specifications - Dell OptiPlex 755 | User's Guide - Page 101
lights four lights on the front panel (See "Diagnostic Lights" on page 347.) Standby power light AUX_PWR on the system board Power DC power supply: Wattage NOTE: Power consumption from an AC power source can be zero when the computer is unplugged from that power source, but the internal battery - Dell OptiPlex 755 | User's Guide - Page 102
Storage Airborne contaminant level 955 BTU/hr NOTE: Heat dissipation is calculated based upon the power supply rating. manual selection power supplies - 90 to 135 V at 50/60 Hz; 180 to 265 V at 50/60 35,000 ft) G2 or lower as defined by ISA-S71.04-1985 102 Desktop Computer Specifications - Dell OptiPlex 755 | User's Guide - Page 103
that cools your computer. Your Dell™ computer supports a PS/2 serial port adapter and provides the following connectors on the system board for PCI and PCI Express cards: • Two connectors for low-profile PCI cards • One connector for a low-profile PCI Express x16 card NOTE: Your Dell computer - Dell OptiPlex 755 | User's Guide - Page 104
an empty card connector on the system board, remove the filler bracket to create a card-slot opening at the back of the computer. Then continue with step 6. 5 If you are installing a card to replace one already installed in the computer, remove the installed card (see "Removing a PCI Card" on page - Dell OptiPlex 755 | User's Guide - Page 105
computer when they are connected to a network. To guard against electrical shock, be sure to unplug your computer from its electrical outlet before installing any cards. 7 If you are installing a PCI Express x16 card, hold the securing-tab release lever away from the - Dell OptiPlex 755 | User's Guide - Page 106
2 1 4 5 1 PCI Express x16 card 2 release lever 3 securing slot (not all cards) 4 securing tab 5 PCI Express x16 card connector 8 Place the card in the connector and press down firmly. Using the following illustration as a guide, ensure that the card is fully seated in the slot. 106 Expansion Cards - Dell OptiPlex 755 | User's Guide - Page 107
slot 4 bracket caught outside of slot NOTE: If you are installing a PCI Express x16 card, ensure that the securing tab on the connector's release lever fits into the notch on the front end of the card. 9 Gently rotate the release tab downward to move the card-retention latch into place to secure the - Dell OptiPlex 755 | User's Guide - Page 108
Controller, and change the setting to Off (see "Entering System Setup" on page 280). b Connect external audio devices to the sound card's connectors. Do not connect external audio devices to the microphone, speaker/headphone, or line-in connectors on the back or front panel. 13 If you installed - Dell OptiPlex 755 | User's Guide - Page 109
the network cable to the integrated network connector on the back panel of the computer. 14 Install any drivers required for the card as described in the card documentation. Removing a PCI Card 1 Follow the procedures in "Before You Begin" on page 21. 2 Remove the computer cover (see "Removing the - Dell OptiPlex 755 | User's Guide - Page 110
computer and maintain the airflow that cools your computer. 8 Rotate the release tab downward to snap the card-retention latch into place. NOTICE: the card's driver. See the documentation that came with the card for instructions. 11 If you removed a sound card: a Enter system setup, select Audio - Dell OptiPlex 755 | User's Guide - Page 111
network connector on the back panel of the computer. Installing a PCI Card in the Riser-Card Cage 1 Follow the procedures in "Before You Begin" on page the card installed in the PCI3 connector on the system board. 4 Remove the riser-card cage: a Check any cables connected to cards through - Dell OptiPlex 755 | User's Guide - Page 112
it out of its connector. NOTE: See the documentation that came with the card for information on configuring the card, making internal connections, or customizing it for your computer. 6 Prepare the new card for installation. CAUTION: Some network adapters automatically start the computer when they - Dell OptiPlex 755 | User's Guide - Page 113
card cage down into place. b Ensure that the riser cards are fully seated in the connectors on the system board. 1 2 3 4 1 riser-card cage 3 riser cards (2) 2 slots 4 system board you installed a sound card, perform the following steps: a Enter system setup, select Audio Controller, and change - Dell OptiPlex 755 | User's Guide - Page 114
If you disable the integrated network adapter, you will not have AMT functionality. 16 Install any drivers required for the card as described in the card documentation. Removing a PCI Card From the Riser-Card Cage 1 Follow the procedures in "Before You Begin" on page 21. 2 Remove the computer cover - Dell OptiPlex 755 | User's Guide - Page 115
board connectors (2) 10 Replace the computer cover (see "Replacing the Computer Cover" on page 317), reconnect the computer and devices to electrical outlets, and then turn them on. 11 Uninstall the card's driver. See the documentation that came with the card for instructions. Expansion Cards - Dell OptiPlex 755 | User's Guide - Page 116
280). b Connect external audio devices to the audio connectors on the computer back panel. 13 If you removed a network adapter card: a Enter system Serial Port Adapter CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide - Dell OptiPlex 755 | User's Guide - Page 117
5 Align the PS/2 serial-port adapter bracket in the retention slot and press down firmly. Ensure that the adapter is fully seated in the slot. 6 Before you close the card retention mechanism, ensure that: • The tops of all cards and filler brackets are flush with the alignment bar. • The notch in - Dell OptiPlex 755 | User's Guide - Page 118
release tab 2 4 serial port adapter connector 5 adapter retention latch 3 serial port adapter system board connector (SERIAL2) PS/2 serial-port adapter bracket 8 Connect the adapter cable to the PS/2 serial port adapter connector (SERIAL2) on the system board (see "System Board Components" on - Dell OptiPlex 755 | User's Guide - Page 119
bracket fits around the alignment guide. 8 Secure any remaining card(s) by closing the card retention latch and snapping it into place. 9 Replace the computer cover (see "Replacing the Computer Cover" on page 317). Installing a PS/2 Serial Port Adapter in the Riser-Card Cage 1 Follow the procedures - Dell OptiPlex 755 | User's Guide - Page 120
outlet before installing any cards or adapters. 8 Align the PS/2 serial-port adapter bracket in the card retention mechanism, ensure that: • The tops of all cards and filler brackets are flush with the alignment bar. • The notch in the top of the card or filler bracket fits around the alignment guide - Dell OptiPlex 755 | User's Guide - Page 121
the system board. c Rotate the riser-card cage handle to the down position. 13 Connect any disconnected cables. 14 Replace the computer cover (see "Replacing the Computer Cover" on page 317). 15 Install any drivers required for the PS/2 serial port adapter. Removing a PS/2 Serial Port Adapter From - Dell OptiPlex 755 | User's Guide - Page 122
the release tab on the card retention latch from the inside to pivot the latch open. Pivot the latch until it snaps into the open position. 5 Disconnect the PS/2 serial-port cable from the system board (see "System Board Components" on page 95). 6 Grasp the PS/2 serial-port adapter bracket by its - Dell OptiPlex 755 | User's Guide - Page 123
Uninstall the adapter's driver. See the documentation that came with the adapter for instructions. eSATA eSATA powered down before removal and/or replacement. CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide - Dell OptiPlex 755 | User's Guide - Page 124
Replace the computer cover (see "Replacing the Computer Cover" on page 317). 6 Boot your computer and enter system setup (see "Entering System Setup" on page 280). . 3 Press the blue release tab to remove the filler panel for the card slot you are using for the eSATA connector. 124 Expansion - Dell OptiPlex 755 | User's Guide - Page 125
4 Insert the bracket for the eSATA connector into that opening and press down on the release tab to hold the bracket in place. 5 Plug the free end of the eSATA cable into the eSATA connector on the system board. Expansion Cards 125 - Dell OptiPlex 755 | User's Guide - Page 126
6 Replace the riser. 1 2 3 4 1 riser-card cage 3 riser cards (2) 2 slots 4 system board connectors (2) 7 Replace the computer cover (see "Replacing the Computer Cover" on page 317). 8 Boot your computer and enter system setup (see "Entering System Setup" on page 280). Use the esata option to - Dell OptiPlex 755 | User's Guide - Page 127
Your computer supports: • One SATA (serial ATA) hard drive • One 3.5-inch drive bay (to support a floppy drive, media card reader, or Dell if you need a drive bay insert. 1 2 3 1 optical drive 2 floppy drive 3 hard drive General Drive Installation Guidelines SATA connectors on the system board - Dell OptiPlex 755 | User's Guide - Page 128
connect the SATA optical drive to the SATA2 connector. (See "System Board Components" on page 95 for the location of the SATA connectors on the system board.) Connecting Drive Cables When you install a drive, you connect two cables-a DC power cable and a data interface cable-to the back of the drive - Dell OptiPlex 755 | User's Guide - Page 129
Connecting and Disconnecting Drive Cables When removing a cable with a pull-tab, grasp the colored pull-tab and pull until the connector detaches. When connecting and disconnecting a cable without a pull tab, hold the cable by the black connector at each end. Drive Inserts Your computer will come - Dell OptiPlex 755 | User's Guide - Page 130
1 1 metal insert 5 Press the release tabs on the plastic insert and press from behind to remove. 1 2 1 2 130 Drives 1 shoulder screws 2 plastic drive insert - Dell OptiPlex 755 | User's Guide - Page 131
the procedures in this section, follow the safety instructions in the Product Information Guide. CAUTION: To guard against electrical shock, always (floppy drive or media card reader) installed, the appropriate drive bay insert must be installed in place of the drive. Contact Dell if you need a drive - Dell OptiPlex 755 | User's Guide - Page 132
release latch 2 optical drive 4 Disconnect the power and data cables from the back of the drive. 5 If you are not replacing the optical drive at this time, install the optical drive insert by lowering it into the drive bay until it clicks into place. Contact Dell if you need a drive bay insert - Dell OptiPlex 755 | User's Guide - Page 133
shoulder screws from the existing drive. c Insert the three shoulder screws into the sides of the new drive and tighten them. 5 Connect the power and data cables to the drive. 6 Align the shoulder screws with the screw guides, and slide the drive into the bay until it clicks into place. Drives 133 - Dell OptiPlex 755 | User's Guide - Page 134
that your computer works correctly by running the Dell Diagnostics (see "Dell Diagnostics" on page 353). Floppy Drive CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. CAUTION: To guard against electrical shock, always - Dell OptiPlex 755 | User's Guide - Page 135
the floppy drive the back of the computer. Then, lift up to remove the drive from the computer. 1 2 1 drive release latch 2 floppy drive 5 Disconnect the power and data cables from the back of the floppy drive. 6 If you are not replacing the floppy drive or media - Dell OptiPlex 755 | User's Guide - Page 136
the drive panel insert. 1 1 drive insert 2 If you are replacing an existing floppy drive: Remove the four shoulder screws from the existing drive or media card reader. 3 Insert the four shoulder screws into the sides of the new floppy drive and tighten them. 136 Drives - Dell OptiPlex 755 | User's Guide - Page 137
Setup" on page 280). 10 Verify that your computer works correctly by running the Dell Diagnostics (see "Dell Diagnostics" on page 353). Media Card Reader CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. Drives 137 - Dell OptiPlex 755 | User's Guide - Page 138
drive or a 3.5-inch drive installed, the appropriate drive bay insert must be installed in place of the drive. Contact Dell if you need a drive bay insert. Removing a Media Card Reader 1 Follow the procedures in "Before You Begin" on page 21. 2 Remove the computer cover (see "Removing the Computer - Dell OptiPlex 755 | User's Guide - Page 139
from the back of the media card reader and from the system board. 6 If you are not replacing the media card reader at this time, install the 3.5 inch drive insert (see "Replacing Drive Inserts" on page 131). Contact Dell if you need a drive bay insert. Installing a Media Card Reader 1 If you are - Dell OptiPlex 755 | User's Guide - Page 140
you are replacing an existing media card reader: Remove the four shoulder screws from the existing media card reader. 3 Insert the four shoulder screws into the sides of the new media card reader and tighten them. 4 Attach the cable to the media card reader and system board connector. 140 Drives - Dell OptiPlex 755 | User's Guide - Page 141
5 Align the shoulder screws with the screw guides, and slide the media card reader into the bay until it clicks into place. 1 power cable 2 slot verification number Drives 141 - Dell OptiPlex 755 | User's Guide - Page 142
that your computer works correctly by running the Dell Diagnostics (see "Dell Diagnostics" on page 353). Hard Drive CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. CAUTION: To guard against electrical shock, always - Dell OptiPlex 755 | User's Guide - Page 143
1 2 1 securing clips (2) 2 hard drive Installing a Hard Drive 1 Check the documentation for the drive to verify that it is configured for your computer. NOTICE: To avoid damage to the drive, do not set it on a hard surface. Instead, set the drive on a surface, such as a foam pad, that will - Dell OptiPlex 755 | User's Guide - Page 144
Attach the bracket to the new drive by snapping it onto the drive. 1 2 3 4 1 securing tabs (2) 2 drive 3 release tabs (2) 4 plastic hard drive bracket 5 Connect the power and data cables to the drive. 6 Locate the correct slot for the drive, and slide the drive into the bay until it clicks into - Dell OptiPlex 755 | User's Guide - Page 145
a bootable medium into your boot drive. 11 Turn on the computer. 12 Enter system setup, and update the SATA port option under the Drives option instructions, see the documentation that came with your operating system. 15 Test the hard drive by running the Dell Diagnostics (see "Dell Diagnostics - Dell OptiPlex 755 | User's Guide - Page 146
RAID configuration, see "About RAID Configurations" on page 295. CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide drive is restricted to certain configurations of the Desktop computer. 1 Check the documentation for the - Dell OptiPlex 755 | User's Guide - Page 147
10 Locate an unused SATA connector on the system board and attach a data cable from the second hard drive to the SATA connector. NOTICE: Always connect the data cable to the SATA1 connector when installing a second hard drive. Drives 147 - Dell OptiPlex 755 | User's Guide - Page 148
reboot the computer. 16 Partition and logically format your drive. NOTE: For instructions, see the documentation that came with your operating system. 17 Test the hard drive by running the Dell Diagnostics (see "Dell Diagnostics" on page 353). 18 Install your operating system on the hard drive. NOTE - Dell OptiPlex 755 | User's Guide - Page 149
Processor CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide. NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your computer's - Dell OptiPlex 755 | User's Guide - Page 150
NOTICE: When replacing the processor, do not touch any of the pins inside the socket or allow any objects to fall on the pins in the socket. 5 Gently remove the processor from the socket. Leave the release lever extended in the release position so that the socket is ready for the new processor. - Dell OptiPlex 755 | User's Guide - Page 151
, ensure that the processor aligns properly with the socket, and do not use excessive force when you install the processor. 7 Set the processor lightly in the socket and ensure that the processor is positioned correctly. 8 When the processor is fully seated in the socket, close the processor cover - Dell OptiPlex 755 | User's Guide - Page 152
12 Install the heat sink assembly: a Place the heat sink assembly back onto the heat-sink assembly bracket. b Rotate the heat sink assembly down towards the computer base and tighten the two captive screws. NOTICE: Ensure that the heat sink assembly is correctly seated and secure. 1 2 3 1 heat sink - Dell OptiPlex 755 | User's Guide - Page 153
procedures in this section, follow the safety instructions located in the Product Information Guide. CAUTION: To guard against electrical shock, of the way. 5 Remove the screw that secures the I/O panel to the desktop computer. NOTICE: When sliding the I/O panel out of the computer, be extremely - Dell OptiPlex 755 | User's Guide - Page 154
3 I/O cable connector 4 I/O connector pull loop Replacing the I/O Panel To replace the I/O panel, follow the removal procedures in the reverse order. NOTE: Use the guides on the I/O panel bracket to help position the I/O panel in place and use the notch on the I/O panel bracket to help seat the - Dell OptiPlex 755 | User's Guide - Page 155
Power Supply Replacing the Power Supply CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide Disconnect the DC power cables from the system board and the drives. Note the routing of the DC power cables underneath the - Dell OptiPlex 755 | User's Guide - Page 156
button 2 power supply 3 screws (2) 4 AC power connector 7 Slide the power supply toward the front of the computer approximately one inch. 8 Lift the power supply up and out of the computer. 9 Slide the replacement power supply into place. 10 Replace the screws that secure the power supply to the - Dell OptiPlex 755 | User's Guide - Page 157
DC Power Connectors DC Power Connector P1 13 14 15 16 17 18 19 20 21 22 23 24 1 2 3 4 5 6 7 8 9 10 11 12 Pin Number Signal name 1 +3.3 VDC 2 +3.3 VDC 3 GND 4 +5 VDC 5 GND 18-AWG Wire Orange Orange Black Red Black Power Supply 157 - Dell OptiPlex 755 | User's Guide - Page 158
15 GND Black 16 PWR_PS_ON* Green 17 GND Black 18 GND Black 19 GND Black 20 NC NC 21 +5 VDC Red 22 +5 VDC Red 158 Power Supply - Dell OptiPlex 755 | User's Guide - Page 159
Pin Number Signal name 18-AWG Wire 23 +5 VDC 24 GND Red Black *Use 22-AWG wire instead of 18-AWG wire. DC Power Connector P2 3 4 Pin Number Signal Name 18-AWG Wire 1 2 1 GND Black 2 GND Black 3 +12 VDC Yellow 4 +12 VDC Yellow Power Supply 159 - Dell OptiPlex 755 | User's Guide - Page 160
3 GND Black 4 +5 VDC Red DC Power Connector P4 4 321 Pin Number Signal Name 22-AWG Wire 1 +5 VDC Red 2 GND Black 3 GND Black 4 +12 VDC Yellow DC Power Connector P5 and P6 Pin Number Signal name 18-AWG Wire 1 +3.3 VDC Orange 2 GND Black 3 +5 VDC Red 160 Power Supply - Dell OptiPlex 755 | User's Guide - Page 161
Pin Number Signal name 18-AWG Wire 4 GND Black 5 +12 VDC Yellow Power Supply 161 - Dell OptiPlex 755 | User's Guide - Page 162
162 Power Supply - Dell OptiPlex 755 | User's Guide - Page 163
of the procedures in this section, follow the safety instructions located in the Product Information Guide. NOTICE: To prevent static damage to components inside your the computer. 4 Connect the cables to the system board. 5 Replace the computer cover. 6 Turn on power to the computer. Speakers 163 - Dell OptiPlex 755 | User's Guide - Page 164
of the procedures in this section, follow the safety instructions located in the Product Information Guide. NOTICE: To prevent static damage to components inside 90). 3 Disconnect the cables from the system board. 4 Remove the speaker from the chassis of the computer. 5 Replace the computer cover. 6 - Dell OptiPlex 755 | User's Guide - Page 165
. 5 diagnostic lights Use the lights to help you troubleshoot a computer problem based on the diagnostic code. For more information, see "Diagnostic Lights" on page 347. 6 hard drive activity light This light flickers when the hard drive is being accessed. 165 Small Form Factor Computer - Dell OptiPlex 755 | User's Guide - Page 166
more information about sleep modes and exiting from a power-saving mode, see "Power Management for Windows XP and Windows Vista" on page 292. See "Dell Diagnostics" on page 353 for a description of light codes that can help you troubleshoot problems with your computer. Use the headphone connector to - Dell OptiPlex 755 | User's Guide - Page 167
manual voltage-selection switch. To help avoid damaging a computer with a manual voltage selection switch, set the switch for the voltage that most closely matches the AC power parallel connector 2 link integrity light 5 6 8 7 Connect an installed card containing a Small Form Factor Computer 167 - Dell OptiPlex 755 | User's Guide - Page 168
network activity light Flashes a yellow light when the and keyboards. 8 video connector Plug the card that supports dual monitors, use the y-cable that came with your computer. 9 serial connector Connect a serial device, such as a handheld device, to the serial port Small Form Factor Computer - Dell OptiPlex 755 | User's Guide - Page 169
Computer CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. CAUTION: To avoid electrical shock, always unplug your computer from the electrical outlet before removing the computer cover. Small Form Factor Computer 169 - Dell OptiPlex 755 | User's Guide - Page 170
of the procedures in this section, follow the safety instructions located in the Product Information Guide. NOTE: The chassis intrusion switch is standard on the ultra small form factor computer but is optional on mini tower, desktop, and small form factor computers; it may not be present on your - Dell OptiPlex 755 | User's Guide - Page 171
Reconnect the cable to the system board. 3 Replace the hard drive ( DELL™ logo appears, press immediately. If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft® Windows® desktop. Then shut down your computer and try again. Small Form Factor - Dell OptiPlex 755 | User's Guide - Page 172
right-arrow key to select Reset. Change the setting to On, On-Silent, or Disabled. NOTE: The default setting is On-Silent. 4 Save your BIOS settings and exit system setup. System Board Components 1 2 3 21 20 19 4 18 17 5 6 16 7 15 14 13 12 11 172 Small Form Factor Computer 10 9 8 - Dell OptiPlex 755 | User's Guide - Page 173
switch connector (INTRUDER) 14 battery socket (BATTERY) 15 PCI Express x16 connector (SLOT1) 16 PCI connector (SLOT2) 17 serial connector (SERIAL2) 18 system board speaker (BEEP) 19 aux power LED (aux_LED) 20 floppy drive connector (DSKT) 21 fan connector (FAN_CPU) Small Form Factor Computer 173 - Dell OptiPlex 755 | User's Guide - Page 174
174 Small Form Factor Computer - Dell OptiPlex 755 | User's Guide - Page 175
64-bit operating system: 8 GB 32-bit operating system: 4 GB F0000h Intel Q35 Express Chipset w/ICH9DO 64 bits 32 bits eight 24 32 Mb integrated network interface with ASF 1.03 and 2.0 support as defined by DMTF Capable of 10/100/1000 communication iAMT 3.0 Small Form Factor Computer Specifications - Dell OptiPlex 755 | User's Guide - Page 176
Express 1.0A SATA 1.0A and 2.0 USB 2.0 PCI: 133 MBs PCI Express x16: 8 GB/s bidirectional speed SATA: 1.5 Gbps and 3.0 Gbps USB: 480 Mbps low-profile cards supported one 120 pins 32 bits one x16 25 W (maximum) 164 pins (x16) 16 PCI Express lanes (x16) 176 Small Form Factor Computer Specifications - Dell OptiPlex 755 | User's Guide - Page 177
one 7-pin connector Floppy drive 34-pin connector Serial 12-pin connector for optional secondary serial port card Fan two 5-pin connectors PCI 2.3 one 120-pin connector PCI Express one 164-pin (x16) connector Front panel 40-pin connector Small Form Factor Computer Specifications 177 - Dell OptiPlex 755 | User's Guide - Page 178
from an AC power source can be zero when the computer is unplugged from that power source. However, the computer draws minimal power from the internal coin cell battery even when the computer is not drawing power from the AC power source. 275 W 178 Small Form Factor Computer Specifications - Dell OptiPlex 755 | User's Guide - Page 179
Storage Airborne contaminant level 938 BTU/hr NOTE: Heat dissipation is calculated based upon the power supply rating. manual selection power supplies - 90 to 135 V at 50/60 Hz; 180 to 265 V at 50/ 35,000 ft) G2 or lower as defined by ISA-S71.04-1985 Small Form Factor Computer Specifications 179 - Dell OptiPlex 755 | User's Guide - Page 180
180 Small Form Factor Computer Specifications - Dell OptiPlex 755 | User's Guide - Page 181
the airflow that cools your computer. Your Dell™ computer supports a PS/2 serial port adapter and provides the following connectors for PCI and PCI Express cards: • One low-profile PCI card slot • One low-profile PCI Express x16 card slot NOTE: Your Dell computer uses only PCI and PCI Express slots - Dell OptiPlex 755 | User's Guide - Page 182
tab 4 card-edge connector 2 card retention latch 5 card connector 3 card 4 If you are installing a new card, remove the filler bracket to create a card-slot opening. Then continue with step 6. 5 If you are replacing a card that is already installed in the computer, remove the card. If necessary - Dell OptiPlex 755 | User's Guide - Page 183
card or filler bracket fits around the alignment guide 9 Secure the card(s) by closing the card retention latch and snapping it into place. NOTICE: Do not route card cables over the cards. Cables routed over the cards audio devices to the sound card's connectors. Do not connect external audio - Dell OptiPlex 755 | User's Guide - Page 184
AMT functionality. 14 Install any drivers required for the card as described in the card documentation. Removing a PCI Card 1 Follow the procedures in 168). NOTE: For PCI card locations, see "System Board Components" on page 172. 3 Gently lift the release tab on the card retention latch from the - Dell OptiPlex 755 | User's Guide - Page 185
cover (see "Replacing the Computer Cover" on page 317). 10 Uninstall the card's driver. See the documentation that came with the card for instructions. 11 If you removed a sound card: a Enter system setup, select Integrated Audio from the Onboard Devices group, and change the setting to On (see - Dell OptiPlex 755 | User's Guide - Page 186
Begin" on page 21. 2 Remove the computer cover (see "Removing the Computer Cover" on page 168). NOTE: For PCI card locations, see "System Board Components" on page 172. 3 Gently lift the release tab on the card retention latch from the inside and pivot the latch open. 4 If you are installing a new - Dell OptiPlex 755 | User's Guide - Page 187
1 2 1 PCI Express x16 DVI-card 2 DVI card connector 3 3 PCI Express x16 card connector Expansion Cards 187 - Dell OptiPlex 755 | User's Guide - Page 188
in the top of the card or filler bracket fits around the alignment guide. 10 Secure the card(s) by closing the card retention latch and snapping it Setup" on page 280). b Connect external audio devices to the sound card's connectors. Do not connect external audio devices to the line-in connector on - Dell OptiPlex 755 | User's Guide - Page 189
cable to the integrated network connector on the back panel of the computer. 14 Install any drivers required for the card as described in the card documentation. Removing a PCI Express x16 Card or DVI Card 1 Follow the procedures in "Before You Begin" on page 21. 2 Remove the computer cover (see - Dell OptiPlex 755 | User's Guide - Page 190
over the cards can prevent the computer cover from closing properly or cause damage to the equipment. 11 Replace the computer cover (see "Replacing the Computer Cover" on page 317). 12 Uninstall the card's driver. See the documentation that came with the card for instructions. 190 Expansion Cards - Dell OptiPlex 755 | User's Guide - Page 191
integrated network connector on the back panel of the computer. PS/2 Serial Port Adapter CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. NOTICE: To prevent static damage to components inside your computer, discharge - Dell OptiPlex 755 | User's Guide - Page 192
Cover" on page 168). 3 Gently lift the release tab on the card retention latch from the inside to pivot the latch open. Pivot the latch until it snaps into the open position. 4 Disconnect the PS/2 serial-port cable from the system board (see "System Board Components" on page 172). 192 Expansion - Dell OptiPlex 755 | User's Guide - Page 193
recognizes the change. However, the computer must be powered down before removal and/or replacement. CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide. NOTICE: To prevent static damage to components inside - Dell OptiPlex 755 | User's Guide - Page 194
4 Plug the free end of the eSATA cable into the eSATA connector on the system board (see "System Board Components" on page 172). 5 Replace the computer cover (see "Replacing the Computer Cover" on page 317). 6 Boot your computer and enter system setup (see "Entering System Setup" on page 280). Use - Dell OptiPlex 755 | User's Guide - Page 195
Drives Your computer supports: • One SATA (serial ATA) hard drive • One slimline floppy drive or media card reader • One SATA slimline optical drive • One eSATA drive 2 3 1 1 3.5-inch drive bay for optional floppy drive or media card reader 2 slimline optical drive 3 hard drive General Installation - Dell OptiPlex 755 | User's Guide - Page 196
interface cable) to the back of the drive. Data Interface Connectors Serial ATA (SATA) Connector Power Cable Connectors 1 2 1 data interface cable connector 2 data interface connector 1 2 1 power cable 2 power input connector Connecting and Disconnecting Drive Cables When removing an cable with - Dell OptiPlex 755 | User's Guide - Page 197
of the procedures in this section, follow the safety instructions in the Product Information Guide. CAUTION: To guard against electrical shock, always Cover" on page 168). 5 Lay the computer on its side so that the system board is on the bottom of the inside of the computer. 6 Press in on the two - Dell OptiPlex 755 | User's Guide - Page 198
1 2 1 securing tabs (2) 2 hard drive 8 Disconnect the power and data cable from the drive. 9 Disconnect the hard drive fan cable from the system board. 198 Drives - Dell OptiPlex 755 | User's Guide - Page 199
1 2 1 power cable 2 SATA data cable Installing a Hard Drive 1 Check the documentation for the drive to verify that it is configured for your computer. NOTICE: To avoid - Dell OptiPlex 755 | User's Guide - Page 200
1 2 3 1 release tabs (2) 2 hard drive 3 hard drive bracket 4 Connect the hard drive fan cable to the system board. 5 Connect the power and data cables to the drive. 200 Drives - Dell OptiPlex 755 | User's Guide - Page 201
1 2 1 power cable 2 SATA data cable 6 Check all connectors to ensure that they are properly cabled and firmly seated. 7 Gently position the drive until it clicks into place. Drives 201 - Dell OptiPlex 755 | User's Guide - Page 202
14 Test the hard drive by running the Dell Diagnostics (see "Dell Diagnostics" on page 353). 15 Install your operating system on the hard drive. NOTE: For instructions, see the documentation that came with your operating system. Replacing a Hard Drive Fan 1 Follow the procedures in "Before You Begin - Dell OptiPlex 755 | User's Guide - Page 203
by the arrow on the back panel of the fan. c Lift to remove the fan and its back panel from the hard drive bracket. 1 2 3 4 1 fan release tab 2 fan with fan back panel 3 power cable 4 hard drive bracket 6 To replace the hard drive fan: a Turn the fan upside-down, so that its backing faces up - Dell OptiPlex 755 | User's Guide - Page 204
follow the safety instructions in the Product Information Guide. CAUTION: To 3 Lay the computer on its side so that the system board is on the bottom of the inside of the computer. optical drive 5 Disconnect the power and data cable from the back of the drive. NOTE: The power and data cables for - Dell OptiPlex 755 | User's Guide - Page 205
in "Before You Begin" on page 21. 4 Remove the computer cover (see "Removing the Computer Cover" on page 168). 5 Connect the power and data cable to the drive. NOTE: The power and data cables for the slimline optical drive installed in your computer are configured in one of two ways as illustrated - Dell OptiPlex 755 | User's Guide - Page 206
that your computer works correctly by running the Dell Diagnostics (see "Dell Diagnostics" on page 353). Floppy Drive CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. CAUTION: To guard against electrical shock, always - Dell OptiPlex 755 | User's Guide - Page 207
edge connector. 1 2 1 cable release tab 2 data cable edge connector 7 Disconnect the data cable from the system board. 8 Pull up on the drive release latch and slide the floppy drive or media card reader towards the back of the computer. Then lift up to remove the drive. 9 Replace the computer - Dell OptiPlex 755 | User's Guide - Page 208
drive and press down on the tab until it clicks to lock it in place. 4 Insert the data cable into the connector on the system board. 208 Drives - Dell OptiPlex 755 | User's Guide - Page 209
of the way to provide airflow for the fan and cooling vents. 7 Replace the computer cover (see Dell Diagnostics (see "Dell Diagnostics" on page 353). Media Card Reader CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide - Dell OptiPlex 755 | User's Guide - Page 210
Removing a Media Card Reader 1 Follow the procedures in "Before You Begin" on page 21. 2 Lay the computer on its side so that the system board is on the bottom of the inside of the computer. 3 Remove the computer cover (see "Removing the Computer Cover" on page 168). 4 Remove the optical - Dell OptiPlex 755 | User's Guide - Page 211
Cover" on page 168). c Lay the computer on its side so that the system board is on the bottom of the inside of the computer. d Remove the drive panel insert. 3 Align the screws on the media card reader with the bracket slots in the computer, and gently position the drive until it - Dell OptiPlex 755 | User's Guide - Page 212
fan and cooling vents. 7 Replace the computer cover (see "Replacing the Computer Cover" on page 317). 8 See the documentation that came with the drive for instructions on installing any software required for drive operation. 9 Verify that your computer works correctly by running the Dell Diagnostics - Dell OptiPlex 755 | User's Guide - Page 213
procedures in this section, follow the safety instructions located in the Product Information Guide. NOTICE: To prevent static damage to very hot during normal operation. Be sure that it has had sufficient time to cool before you touch it. 4 Rotate the heat sink assembly upward, and remove the - Dell OptiPlex 755 | User's Guide - Page 214
5 Open the processor cover by sliding the release lever from under the center cover latch on the socket. Then, pull the lever back to release the processor. 2 3 4 1 5 1 center cover latch 2 processor cover 3 processor 4 socket 5 release lever NOTICE: When replacing the processor, do not touch any - Dell OptiPlex 755 | User's Guide - Page 215
avoid damage, ensure that the processor aligns properly with the socket, and do not use excessive force when you install the processor. 7 Set the processor lightly in the socket and ensure that the processor is positioned correctly. Processor 215 - Dell OptiPlex 755 | User's Guide - Page 216
8 When the processor is fully seated in the socket, close the processor cover. Ensure that the tab on the processor cover is positioned underneath the center cover latch on the socket. 9 Pivot the socket release lever back toward the socket and snap it into place to secure the processor. 10 Clean - Dell OptiPlex 755 | User's Guide - Page 217
the safety instructions located in the Product Information Guide. CAUTION: board. • Unscrew all retaining screws on the system board (see "Small Form Factor System Board Screws" on page 310). • Gently lift the system board out of the chassis. 7 Remove the front fan: Press the tab that secures the fan - Dell OptiPlex 755 | User's Guide - Page 218
4 mounting screw 5 I/O panel 9 Remove cables from the system board. 10 From inside the computer cover, remove the mounting screw that the I/O panel, follow the removal procedures in the reverse order. NOTE: Use the guides on the I/O panel bracket to help position the I/O panel in place and use the - Dell OptiPlex 755 | User's Guide - Page 219
Power Supply Replacing the Power Supply CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide. NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before - Dell OptiPlex 755 | User's Guide - Page 220
Replace the screws that secure the power supply to the back of the computer chassis. 11 Reconnect the DC power cables to the system board and drives (see "System Board Components" on page 172 for connector locations). 12 Replace the floppy drive or media card reader (see "Installing a Floppy Drive - Dell OptiPlex 755 | User's Guide - Page 221
Connectors NOTE: The power supply installed in your computer is one of two options as illustrated below. DC Power Connector P1 13 14 15 16 17 18 19 20 21 22 23 24 1 2 3 4 5 6 7 8 9 10 11 12 Pin Number Signal Name 1 +3.3 VDC 2 +3.3 VDC 3 GND 4 VCC (+5 V) 5 - Dell OptiPlex 755 | User's Guide - Page 222
Black 16 PWR_PS_ON Green 17 GND Black 18 GND Black 19 GND Black 20 NC NC 21 VCC (+5V) Red 22 VCC (+5V) Red 222 Power Supply - Dell OptiPlex 755 | User's Guide - Page 223
Power Connector P2 3 4 1 2 Pin Signal 18-AWG Number Name Wire 1 GND Black 2 GND Black 3 +12 VDC Yellow 4 +12 VDC Yellow DC Power Connectors P3 Pin Number Signal Name 18-AWG Wire 1 +3.3 VDC Orange 2 GND Black 3 +5 VDC Red 4 GND Black 5 +12 VDC Yellow Power Supply - Dell OptiPlex 755 | User's Guide - Page 224
DC Power Connector P5 Pin Signal Number Name 24-AWG Wire 1 GND Black 2 +5 VDC Red 3 NA NA 4 +3.3 VDC Orange DC Power Connector P6 6 5 4 3 2 1 Pin Signal Number Name 1 NC 2 +5 VDC 3 +5 VDC 4 NC 5 GND 6 GND 24-AWG Wire NC Red Red NC Black Black 224 Power Supply - Dell OptiPlex 755 | User's Guide - Page 225
of the computer. 4 Connect the cables to the system board. 5 Replace the computer cover. 6 Turn on power to the computer. Removing a Speaker CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide. Speakers 225 - Dell OptiPlex 755 | User's Guide - Page 226
You Begin" on page 21. 2 Remove the cover of your computer (see "Removing the Computer Cover" on page 168). 3 Disconnect the cables from the system board. 4 Remove the speaker from the chassis of the computer. 5 Replace the computer cover. 6 Turn on - Dell OptiPlex 755 | User's Guide - Page 227
Small Form Factor Computer About Your Ultra Small Form Factor surface, use the optional wall-mount bracket. To order this bracket, contact Dell (see "Getting Help" on page 365). Front View 1 23 4 System Setup" on page 280 for more information about booting to a USB device). It is recommended that you - Dell OptiPlex 755 | User's Guide - Page 228
For more information about sleep modes and exiting from a power-saving mode, see "Power Management for Windows XP and Windows Vista" on page 292. See "System Lights" on page 345 for a description of light codes that can help you troubleshoot problems with your computer. Press this button to turn on - Dell OptiPlex 755 | User's Guide - Page 229
2 computer cover release knob 3 security cable slot 4 back panel connectors 5 power connector 6 vents See "Diagnostic Lights" on page 347 for a description of light codes that can help you troubleshoot problems with your computer. Rotate this knob in a clockwise direction to remove the cover. See - Dell OptiPlex 755 | User's Guide - Page 230
into the white DVI video connector on the back panel. If you have a VGA monitor, see "Connecting a VGA Monitor" on page 230. Insert the AC power adapter plug. See "Diagnostic Lights" on page 347 for a description of light codes that can help you troubleshoot problems with your computer. Connecting - Dell OptiPlex 755 | User's Guide - Page 231
Use the cable adapter to connect a VGA monitor and a DVI monitor to the DVI-I connector on the back panel. When you connect two monitors, the video driver will detect this connection and activate the multimonitor functionality. Ultra Small Form Factor Computer 231 - Dell OptiPlex 755 | User's Guide - Page 232
in this section, follow the safety instructions in the Product Information Guide. NOTICE: To prevent static damage to card heat sinks can become very hot during normal operation. Ensure that a graphics card heat sink has had sufficient time to cool before you touch it. 232 Ultra Small Form Factor - Dell OptiPlex 755 | User's Guide - Page 233
any of the procedures in this section, follow the safety instructions located in the Product Information Guide. NOTE: The chassis intrusion switch is standard on the ultra small form factor computer but is optional on mini tower, desktop and small form factor computers; it may not be present on your - Dell OptiPlex 755 | User's Guide - Page 234
intrusion switch into its slot until you feel it snap securely into place. 2 Reconnect the cable to the system board. 3 Replace the computer cover (see "Replacing the Computer Cover" on page 317). 4 If you are using a computer stand, attach it to the computer. 234 Ultra Small Form Factor Computer - Dell OptiPlex 755 | User's Guide - Page 235
the blue DELL™ logo appears, press immediately. If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft® Windows® desktop. Then shut setting is On-Silent. 4 Save your BIOS settings and exit system setup. Ultra Small Form Factor Computer 235 - Dell OptiPlex 755 | User's Guide - Page 236
connector (SATA0) 7 battery (BATT) 9 10 8 password jumper (PSWD) 9 hard drive fan connector (FAN_HDD) 10 clear CMOS jumper (RTCRST) 11 hard drive power connector (SATA_PWR) 12 fan connector (FAN_REAR) 13 intrusion switch connector (INTRUDER) 14 processor (CPU) 236 Ultra Small Form Factor Computer - Dell OptiPlex 755 | User's Guide - Page 237
slot (optional). 1 2 1 cable cover 2 security cable slot Removing the Cable Cover 1 If a security device is installed in the security cable slot, remove the device. Ultra Small Form Factor Computer 237 - Dell OptiPlex 755 | User's Guide - Page 238
of the procedures in this section, follow the safety instructions in the Product Information Guide. 1 Connect the AC power adapter to the power connector on the back of the computer. Ensure that the grounding source, and then tighten the grounding source. 238 Ultra Small Form Factor Computer - Dell OptiPlex 755 | User's Guide - Page 239
power adapter by disconnecting and reconnecting the plug to the power outlet. Dell Badge CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. The Dell the tab is secured in the slot. Ultra Small Form Factor Computer 239 - Dell OptiPlex 755 | User's Guide - Page 240
1 2 1 release lever 2 slots (2) with tab in slot 240 Ultra Small Form Factor Computer - Dell OptiPlex 755 | User's Guide - Page 241
Ultra Small Form Factor Computer Specifications Microprocessor Microprocessor type Internal cache Memory Type Memory connectors Memory modules supported Minimum memory Maximum memory BIOS address Computer Information Chipset Data bus width Address bus width DMA channels Interrupt levels BIOS chip ( - Dell OptiPlex 755 | User's Guide - Page 242
Serial Parallel Video Network adapter USB Audio System board connectors: SATA Fan ADI 1984 High Definition Audio 24-bit analog-to-digital; 24-bit digital-to-analog one serial ATA controller supporting connector one 3-pin and two 5-pin connectors 242 Ultra Small Form Factor Computer Specifications - Dell OptiPlex 755 | User's Guide - Page 243
light for a 1000-Mb (1-Gb) operation Activity light (on integrated network yellow blinking light adapter) Diagnostic lights four lights on the back panel (See "Diagnostic Lights" on page 347.) Standby power light AUX_PWR on the system board Ultra Small Form Factor Computer Specifications - Dell OptiPlex 755 | User's Guide - Page 244
power from the internal coin cell battery even when the computer is not drawing power from the AC power source. 220 W 751 BTU/hr NOTE: Heat dissipation is calculated based upon the power supply rating. auto-sensing power supplies cm (14.2 inches) 244 Ultra Small Form Factor Computer Specifications - Dell OptiPlex 755 | User's Guide - Page 245
m (-50 to 10,000 ft) -15.2 to 10,668 m (-50 to 35,000 ft) G2 or lower as defined by ISA-S71.04-1985 Ultra Small Form Factor Computer Specifications 245 - Dell OptiPlex 755 | User's Guide - Page 246
246 Ultra Small Form Factor Computer Specifications - Dell OptiPlex 755 | User's Guide - Page 247
Drives Your computer supports: • One SATA (serial ATA) hard drive • One optional Dell D-module optical drive, second hard drive, . Connecting Drive Cables When you install a drive, you connect two cables-a DC power cable and a data interface cable-to the back of the drive. Data Interface Connectors - Dell OptiPlex 755 | User's Guide - Page 248
Cable Connectors 1 2 1 power cable 2 power input connector Connecting and Disconnecting Drive Cables When connecting and disconnecting a SATA data cable, CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. 248 Drives - Dell OptiPlex 755 | User's Guide - Page 249
CAUTION: To guard against electrical shock, always unplug your computer from the power supply before removing the hard drive. NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any - Dell OptiPlex 755 | User's Guide - Page 250
1 2 3 4 1 hard drive 2 drive rails (2) 3 data cable connector 4 power cable connector 7 Disconnect the data and power cables from the drive connectors. 8 Remove the four screws that secure the drive rails to the existing hard drive, and attach the drive rails to - Dell OptiPlex 755 | User's Guide - Page 251
1 drive 2 drive rails (2) 3 screws (4) NOTICE: Serial ATA data and power connectors are keyed for correct insertion; that is, a notch before you attach the cables to the drive. 9 Attach the data and power cables to the hard drive connectors, ensuring that the connectors are properly oriented - Dell OptiPlex 755 | User's Guide - Page 252
the hard drive by running the Dell Diagnostics (see "Dell Diagnostics" on page 353). 16 Install your operating system on the hard drive. For instructions, see the documentation that came with your operating system. Replacing a Hard Drive Fan 1 Follow the instructions in "Before You Begin" on page - Dell OptiPlex 755 | User's Guide - Page 253
then slide the fan towards the front of the computer so that its side tabs are free of the corresponding slots in the hard drive bracket. c Lift to remove the fan from the hard drive bracket. d Unplug the fan. 4 5 3 2 1 1 hard drive bracket 2 screw 3 fan release tab 4 fan 5 side tab Drives - Dell OptiPlex 755 | User's Guide - Page 254
4 Replace the hard drive fan: a Plug the fan into the computer. b Align the four side tabs and release tab on the fan with the five corresponding slots on the hard drive bracket. c Slide the release tab beneath the metal housing covering its slot, and then slide the fan towards the back of the - Dell OptiPlex 755 | User's Guide - Page 255
Module Bay CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. You can install a Dell™ removable device such as a floppy drive, optical drive, or second hard drive in the module bay. You can also install an airbay (filler - Dell OptiPlex 755 | User's Guide - Page 256
1 2 1 bottom of computer 2 security screw 2 If the module bay contains a device that is locked with the locking switch, remove the cover (see "Removing the Computer Cover" on page 232) and lift the module locking switch to the unlocked position. If a security screw is also used, remove the screw. - Dell OptiPlex 755 | User's Guide - Page 257
1 1 module locking switch 3 Press the device latch release so that the latch release pops out. 1 1 device latch release Module Bay 257 - Dell OptiPlex 755 | User's Guide - Page 258
bay, replace the computer cover (see "Replacing the Computer Cover" on page 317). Removing and Installing a Device When Your Computer Is Running Microsoft® Windows® 1 To remove a device installed in the module bay, double-click the Safely Remove Hardware icon on the taskbar. 2 In the list of devices - Dell OptiPlex 755 | User's Guide - Page 259
Securing a Device in the Module Bay 1 To secure a device in the module bay, your computer is equipped with a module locking switch. To use this switch: a Remove the computer cover (see "Removing the Computer Cover" on page 232). b Gently press the module locking switch down until it locks into place - Dell OptiPlex 755 | User's Guide - Page 260
1 2 1 bottom of computer 2 security screw 260 Module Bay - Dell OptiPlex 755 | User's Guide - Page 261
in this section, follow the safety instructions in the Product Information Guide. CAUTION: To guard against electrical shock Computer Cover" on page 168). 3 Remove the fan shroud by lifting the fan shroud up and away from the computer. 1 1 fan shroud CAUTION: The heat sink can get extremely - Dell OptiPlex 755 | User's Guide - Page 262
4 Remove the heat sink: a Press the release lever on the retention base until the heat sink is released. 1 2 3 4 1 top of heat sink 2 heat sink 3 retention base 4 release tab b Gently lift the heat sink from the processor. c Lay the heat sink down on its top, with the thermal grease facing upward. - Dell OptiPlex 755 | User's Guide - Page 263
, ensure that the processor aligns properly with the socket, and do not use excessive force when you install the processor. 10 Set the processor lightly in the socket and ensure that the processor is positioned correctly. 11 When the processor is fully seated in the socket, pivot the release lever - Dell OptiPlex 755 | User's Guide - Page 264
front alignment-notch 8 socket and processor pin-1 indicator 9 rear alignment-notch If you are installing a processor replacement kit from Dell, return the processor to Dell in the same package in which your replacement kit was sent. NOTICE: Ground yourself by touching an unpainted metal surface on - Dell OptiPlex 755 | User's Guide - Page 265
1 2 3 1 heat sink 2 retention base 3 release lever 15 Lower the heat sink onto the processor at a 45-degree angle so that one end of the heat sink fits securely under the tab opposite the release tab on the retention base. 16 Re-assemble the shroud. 17 Replace the computer cover (see "Replacing the - Dell OptiPlex 755 | User's Guide - Page 266
266 Processor - Dell OptiPlex 755 | User's Guide - Page 267
of the procedures in this section, follow the safety instructions located in the Product Information Guide. NOTICE: To prevent static damage to components inside the computer. 4 Connect the cables to the system board. 5 Replace the computer cover. 6 Turn on power to the computer. Power Supply 267 - Dell OptiPlex 755 | User's Guide - Page 268
procedures in this section, follow the safety instructions located in the Product Information Guide. NOTICE: To prevent static damage to from the system board. 4 Remove the speaker from the chassis of the computer. 5 Replace the computer cover. 6 Turn on power to the computer. 268 Power Supply - Dell OptiPlex 755 | User's Guide - Page 269
is independent of operating state. Your computer supports early versions of the DASH initiative including the following management profiles: • Base Desktop Mobile • Power State Management • Boot Control • CPU • System Memory • Fan • Power Supply • Sensor • Physical Asset • Software Inventory NOTE - Dell OptiPlex 755 | User's Guide - Page 270
breaker) and software version control Your computer aids in troubleshooting iAMT by providing the following iAMT related error messages: Error Message SERVICE_MODE jumper: The service mode jumper is installed MEMORY: Unsupported memory configuration. Populate DIMM1. Description Do not populate the - Dell OptiPlex 755 | User's Guide - Page 271
Power is supplied to the DIMMs even when the computer is turned off. Accessing iAMT setup Intel's Management Engine BIOS iAMT can be provisioned using a USB key and Dell Client Manager. The USB key must: • Be USB port prior to boot. During POST, the BIOS displays a message stating that the - Dell OptiPlex 755 | User's Guide - Page 272
chassis intrusion alert has been cleared. CPU: Emergency Shutdown Event The processor temperature is too hot and the power supply has shut down. Cooling Device: Generic The fan speed (rpm) is out of limits or the fan speed Critical Fan Failure/Generic (rpm) problem has been resolved. Critical - Dell OptiPlex 755 | User's Guide - Page 273
see the Dell OpenManage IT Assistant User's Guide available on the Dell Support website at support.dell.com. Dell OpenManage Client the state of your computer by updating its BIOS, configuring BIOS settings, or shutting it down remotely. With Dell Client Manager installed on a console - Dell OptiPlex 755 | User's Guide - Page 274
Press to select an option setting. 6 Press again after you update the option setting. 7 Exit and save system setup. Option Settings • On - changes to Detected, and the following alert message displays during the boot routine at the next computer start-up: Alert! Cover was previously - Dell OptiPlex 755 | User's Guide - Page 275
NOTE: On the ultra small form factor computer, the security cable the device contains instructions for installing it. supports encryption only if the operating system supports TPM incomplete, lost, or damaged, Dell will be unable to assist and press during the Power On Self Test to enter the - Dell OptiPlex 755 | User's Guide - Page 276
press during the Power On Self Test to boot authentication (using a fingerprint reader, smart card Guide. Computer Tracking Software Computer tracking software may enable you to locate your computer if it is lost or stolen. The software is optional and may be purchased when you order your Dell - Dell OptiPlex 755 | User's Guide - Page 277
card) with something only the user should know (a PIN) to provide more secure userauthentication than passwords alone. The fingerprint reader is a device that you can use to help keep your Dell and use additional forms of protection, a jumper setting on the system board. You can only assign a system - Dell OptiPlex 755 | User's Guide - Page 278
not valid. If you enter one of these combinations, the speaker emits a beep. As you press each character key (or the spacebar for a blank Incorrect password. ** Number of unsuccessful password attempts: 3 System halted! Must power down. Even after your computer is turned off and on, the previous - Dell OptiPlex 755 | User's Guide - Page 279
password is assigned and the password jumper on the system board is in the enabled position (the default setting). Assigning an and verify the password. If a character is not permitted, the computer emits a beep. 3 Type and then verify the password. After you verify the password, the Admin - Dell OptiPlex 755 | User's Guide - Page 280
option such as the user password • To read the current amount of memory or set the type of hard drive installed Before you use system DELL™ logo appears, press immediately. If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft® Windows® desktop - Dell OptiPlex 755 | User's Guide - Page 281
window BIOS Version, Service Tag, Express Service Code, (if applicable), and the Asset Tag. None of these fields can be modified. Identifies the CPU type, bus speed, clock speed, and L2 cache size. States whether the processor is hyperthreading and multiple-core capable and whether it supports 64-bit - Dell OptiPlex 755 | User's Guide - Page 282
to the eSATA connector on the system board and lists the capacities for the hard drives. NOTE: This option is not available on the ultra small form factor computer. SATA Operation Options for Mini Tower and Desktop: (RAID • RAID Autodetect/AHCI (RAID if signed drives, otherwise AHCI) Autodetect - Dell OptiPlex 755 | User's Guide - Page 283
available if a PS/2 serial port adapter is installed. Auto, the default setting, automatically configures a connector to a particular designation (COM2 or COM4). Video Primary Video (Auto default) This setting specifies which video controller is primary, Auto or Onboard/Card. When Auto is selected - Dell OptiPlex 755 | User's Guide - Page 284
) Multiple CPU Core (On default) Virtualization (Off default) VT for Direct I/O Trusted Execution Virtual Appliance VA Config Lock SpeedStep (Off default) Limit CPUID Value (Off default) HDD Acoustic Mode (Bypass default) The hyperthreading option is displayed if the installed processor supports - Dell OptiPlex 755 | User's Guide - Page 285
Execute Disable Enables or disables Execute Disable memory protection technology. (On default) Computrace (Deactivate default) Enables or disables the BIOS interface of the optional Computrace service from Absolute Software. This optional monitoring service must be purchased separately. Activate - Dell OptiPlex 755 | User's Guide - Page 286
and S3, a suspend state in which the power is reduced or turned off for many components, however, system memory remains active. Maintenance Service Tag SERR Message (On default) Load Defaults Event Log Displays the service tag for your computer. Some graphics cards require that the SERR message be - Dell OptiPlex 755 | User's Guide - Page 287
the BIOS will to boot from the primary serial Dell Diagnostics on the Drivers and Utilities media, but you want the computer to boot from the hard drive when the diagnostic tests are complete. You can also use this feature to restart your computer to a USB device such as a floppy drive, memory - Dell OptiPlex 755 | User's Guide - Page 288
To ensure that your device is bootable, check the device documentation. Memory Key 1 Insert the memory key into a USB port and restart the computer. 2 When F12 = Boot Menu appears in the upper-right corner of the screen, press . The BIOS detects the device and adds the USB device option to the - Dell OptiPlex 755 | User's Guide - Page 289
Floppy Drive 1 In system setup, set the Diskette Drive option to USB. 2 Save and exit system setup. 3 Connect the USB floppy drive, insert a bootable floppy, and re-boot the computer. Jumper Settings Mini Tower and Desktop Small Form Factor Advanced Features 289 - Dell OptiPlex 755 | User's Guide - Page 290
Small Form Factor instructions located in the Product Information Guide. NOTICE: This process erases both the system and administrator passwords. 1 Follow the procedures in "Before You Begin" on page 21. 2 Remove the computer cover. 3 Locate the 2-pin password jumper (PSWD) on the system board - Dell OptiPlex 755 | User's Guide - Page 291
® desktop appears on your computer, shut down your computer (see "Turning Off Your Computer" on page 21). 7 Turn off the monitor and disconnect it from the electrical outlet. 8 Disconnect the computer power cable from the electrical outlet, and press the power button to ground the system board - Dell OptiPlex 755 | User's Guide - Page 292
single CPU package, thereby increasing computing efficiency and multi-tasking ability. Intel has implemented this technology in its Dual-Core and Quad-Core processors. These processors have two and four computational units respectively. It is recommended that you use the Microsoft Windows XP Service - Dell OptiPlex 755 | User's Guide - Page 293
When the computer exits from hibernate mode, the desktop is restored to the state it was in memory, Dell creates an appropriately sized hibernate mode file before shipping the computer to you. If the computer's hard drive becomes corrupted, Windows XP recreates the hibernate file automatically. Power - Dell OptiPlex 755 | User's Guide - Page 294
tab. For more information on power management options: 1 Click Start→ Help and Support→ Performance and maintenance. 2 In the Performance and maintenance window, click Conserving power on your computer. Options in Windows Vista The Microsoft Vista power management features can reduce the amount - Dell OptiPlex 755 | User's Guide - Page 295
are available in the computer industry for different types of uses. Your Dell computer supports RAID level 0 and RAID level 1. A RAID level 0 configuration is recommended for high-performance programs, while RAID level 1 is recommended for users that desire a high level of data integrity - Dell OptiPlex 755 | User's Guide - Page 296
a large virtual drive. Data striping allows one of the drives to read data while the other drive is searching for and reading the next block. serial ATA RAID configured for RAID level 0 segment 1 segment 3 segment 5 segment 2 segment 4 segment 6 hard drive 1 hard drive 2 Another advantage of - Dell OptiPlex 755 | User's Guide - Page 297
the primary drive, the data is also duplicated, or mirrored, on the second drive in the configuration. serial ATA RAID configured for RAID level 1 segment 1 segment 2 segment 3 segment 4 segment 5 segment 6 segment 1 duplicated segment 2 duplicated segment 3 duplicated segment 4 duplicated segment - Dell OptiPlex 755 | User's Guide - Page 298
press to exit system setup and resume the boot process. Configuring Your Computer for RAID Using the Intel RAID Option ROM Utility NOTE: Although any size of drives may be used to create a RAID configuration when using the Intel RAID Option ROM utility, ideally the drives should be of equal - Dell OptiPlex 755 | User's Guide - Page 299
RAID volume. 9 Confirm that the correct volume configuration is displayed on the main Intel RAID for RAID Using drives into a RAID volume. • You RAID-enabled mode (see "Setting Your Computer to RAID-Enabled Mode" on page 297). 3 On the Actions menu, select Create RAID Volume to launch the Create RAID - Dell OptiPlex 755 | User's Guide - Page 300
Follow Microsoft Windows procedures for creating a partition on the new RAID volume. Recovering From a Single Hard Drive Failure (RAID 1) Using Exit, and then press . Your computer boots to the operating system and begins rebuilding the RAID volume automatically. A dialog box appears and - Dell OptiPlex 755 | User's Guide - Page 301
as your source hard drive (it should be the hard drive containing the data or operating system files that you want to keep on the RAID volume). 8 On the Select Source Hard Drive screen, double-click the hard drive from which you want to migrate, and click Next. 9 On the Select - Dell OptiPlex 755 | User's Guide - Page 302
as your source hard drive (it should be the hard drive containing the data or operating system files that you want to keep on the RAID volume). 7 On the Select Source Hard Drive screen, double-click the hard drive from which you want to migrate, and click Next. 8 On the Select - Dell OptiPlex 755 | User's Guide - Page 303
Replacing the Battery CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your - Dell OptiPlex 755 | User's Guide - Page 304
off the socket or by breaking circuit traces on the system board. NOTICE: To avoid damage to the battery connector, you must firmly support the connector while removing the battery. 5 Remove the system battery. a Support the battery connector by pressing down firmly on the positive side of the - Dell OptiPlex 755 | User's Guide - Page 305
7 Replace the computer cover (see "Replacing the Computer Cover" on page 317). 8 Enter system setup (see "Entering System Setup" on page 280) and restore the settings you recorded in step 1. 9 Properly dispose of the old battery as described in the Product Information Guide. Battery 305 - Dell OptiPlex 755 | User's Guide - Page 306
306 Battery - Dell OptiPlex 755 | User's Guide - Page 307
from the system board. • Mini tower: see "Mini Tower System Board Screws" on page 308 • Desktop: see "Desktop System Board Screws" on page 309 • Small form factor: see "Small Form Factor System Board Screws" on page 310 • Ultra small form factor: see "Ultra Small Form Factor System Board Screws" on - Dell OptiPlex 755 | User's Guide - Page 308
Mini Tower System Board Screws 1 2 1 mini tower system board 2 screws (9) 308 Replacing the System Board - Dell OptiPlex 755 | User's Guide - Page 309
Desktop System Board Screws 1 2 1 desktop system board 2 screws (9) Replacing the System Board 309 - Dell OptiPlex 755 | User's Guide - Page 310
Small Form Factor System Board Screws 1 2 1 small form factor system board 2 screws (7) 310 Replacing the System Board - Dell OptiPlex 755 | User's Guide - Page 311
Small Form Factor System Board Screws 1 2 1 ultra small form factor system board 2 screws (10) Place the system board assembly that you just removed next to the replacement system board to ensure it is identical. Replacing the System Board: Mini Tower, Desktop, Small Form Factor, and Ultra Small - Dell OptiPlex 755 | User's Guide - Page 312
312 Replacing the System Board - Dell OptiPlex 755 | User's Guide - Page 313
can increase your computer memory by installing memory modules on the system board. Your computer supports DDR2 memory. For additional information on the type of memory supported by your computer, see the appropriate specifications for your system in this book. DDR2 Memory Overview • When installed - Dell OptiPlex 755 | User's Guide - Page 314
are using a 64-bit operating system, your computer will support a maximum of 8 GB (2-GB DIMMs in each of the four slots) of memory. Installing Memory CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. NOTICE: To avoid - Dell OptiPlex 755 | User's Guide - Page 315
connector 4 Align the notch on the bottom of the module with the crossbar in the connector. 3 2 1 4 1 cutouts (2) 4 crossbar 2 memory module 3 notch NOTICE: To avoid damage to the memory module, press the module straight down into the connector while you apply equal force to each end of the - Dell OptiPlex 755 | User's Guide - Page 316
the network port or device and Windows desktop and click Properties. 11 Click the General tab. 12 To verify that the memory is installed correctly, check the amount of memory (RAM) listed. Removing Memory CAUTION: Before you begin any of the procedures in this section, follow the safety instructions - Dell OptiPlex 755 | User's Guide - Page 317
Computer Cover Mini-Tower, Desktop, and Small Form Factor Computers CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. 1 Ensure that all cables are connected, and fold cables out of the way. Gently pull the power cables - Dell OptiPlex 755 | User's Guide - Page 318
of the system. b Slide the computer cover backward until it snaps into place. CAUTION: Graphics card heat sinks can become very hot during normal operation. Ensure that a graphics card heat sink has had sufficient time to cool before you touch it. 1 1 release knob 318 Replacing the Computer Cover - Dell OptiPlex 755 | User's Guide - Page 319
, see "Mini Tower Computer Specifications" on page 35. • For a desktop computer, see "Desktop Computer Specifications" on page 97. • For a small form factor computer, see "Small Form Factor Computer Specifications" on page 175. • For an ultra small form factor computer, see "Ultra Small Form Factor - Dell OptiPlex 755 | User's Guide - Page 320
320 Installing Your Computer in an Enclosure - Dell OptiPlex 755 | User's Guide - Page 321
• If your computer is installed in a corner on a desk or under a desk, leave at least 5.1 centimeters (2 inch) of clearance from the back of the computer to the wall to permit the airflow required for proper ventilation. Installing Your Computer in an Enclosure 321 - Dell OptiPlex 755 | User's Guide - Page 322
• Do not install your computer in an enclosure that does not allow airflow. Restricting the airflow impacts your computer's performance, possibly causing it to overheat. 322 Installing Your Computer in an Enclosure - Dell OptiPlex 755 | User's Guide - Page 323
Cleaning Your Computer CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. Computer, Keyboard, and Monitor CAUTION: Before you clean your computer, disconnect the computer from the electrical outlet. Clean your computer - Dell OptiPlex 755 | User's Guide - Page 324
available cleaning kit. These kits contain pretreated floppy disks to remove contaminants that accumulate during normal operation. CDs and DVDs If you notice problems, such as skipping, with the playback quality of your CDs or DVDs, try cleaning the discs. 1 Hold the disc by its outer edge - Dell OptiPlex 755 | User's Guide - Page 325
instructions, see the following section that corresponds to the operating system that your computer is running. Microsoft® Windows® XP The Microsoft Windows directly connecting a serial cable to the input/output (I/O) ports of the two computers. To transfer data over a serial connection, you must - Dell OptiPlex 755 | User's Guide - Page 326
a wizard disk that will allow you to create a backup image file to removable media. To create a wizard disk, use your new computer with Windows XP and perform the following steps: 1 Open the Files and Settings Transfer Wizard: click Start→ All Programs→ Accessories→ System Tools→ Files and Settings - Dell OptiPlex 755 | User's Guide - Page 327
and files and click Next. Follow the instructions on the screen. The wizard reads the support.dell.com for document #154781 (What Are The Different Methods To Transfer Files From My Old Computer To My New Dell™ Computer Using the Microsoft® Windows® XP Operating System?). NOTE: Access to the Dell - Dell OptiPlex 755 | User's Guide - Page 328
Windows® XP operating system provides a Network Setup Wizard to guide you through the process of sharing files, printers, or an Internet connection between computers in a home or small the Internet enables the integrated firewall provided with Windows XP Service Pack 1 (SP1) or later. 328 Microsoft - Dell OptiPlex 755 | User's Guide - Page 329
checklist and required preparations. 5 Return to the Network Setup Wizard and follow the instructions on the screen. Windows Vista To make changes to your network setup in Microsoft® Windows Vista®: 1 Click the Windows Vista Start button, , and then click Network→ Network and Sharing Center. 2 Click - Dell OptiPlex 755 | User's Guide - Page 330
330 Microsoft Windows XP Features - Dell OptiPlex 755 | User's Guide - Page 331
problem started, review battery still does not work properly, contact Dell (see "Contacting Dell" on page 370). Card Problems Fill out the "Diagnostics Checklist" on page 369 as you complete these checks. CAUTION: Before you begin any of the procedures in this section, follow the safety instructions - Dell OptiPlex 755 | User's Guide - Page 332
Diagnostics. See "Dell Diagnostics" on page 353. If any of the tests fail, the card you just reinstalled is faulty and needs to be replaced. 5 Repeat this process until you have reinstalled all cards. CAUTION: Before you begin any of the procedures in this section, follow the safety instructions - Dell OptiPlex 755 | User's Guide - Page 333
A R E TR O U B L E S H O O T E R - See "Troubleshooting Software and Hardware Problems in the Microsoft® Windows® XP and Microsoft Windows Vista® Operating Systems" on page 358. R U N T H E D E L L D I A G N O S T I C S - See "Dell Diagnostics" on page 353. Optical drive problems NOTE: High-speed - Dell OptiPlex 755 | User's Guide - Page 334
that is 3 meters (10 feet) or more in length, try a shorter one. RUN THE MODEM DIAGNOSTIC TOOL - Windows XP: 1 Click Start→ All Programs→ Modem Helper. 2 Follow the instructions on the screen to identify and resolve modem problems. Modem Helper is not available on certain computers. 334 Solving - Dell OptiPlex 755 | User's Guide - Page 335
instructions on the screen to identify and resolve modem problems. Modem diagnostics are not available on all computers. VERIFY THAT THE MODEM IS COMMUNICATING WITH WINDOWS - Windows XP: 1 Click Start→ Control Panel→ Printers and Other Hardware→ Phone and Modem Options→ Modems. 2 Click the COM port - Dell OptiPlex 755 | User's Guide - Page 336
and Software Problems CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. The computer does not start up C H E C K T H E D I A G N O S T I C L I G H T S - See "Diagnostic Lights" on page 347. ENSURE THAT THE POWER CABLE IS - Dell OptiPlex 755 | User's Guide - Page 337
the instructions on the screen. Windows Vista power button for at least 8 to 10 seconds (until the computer turns off), and then restart your computer. Other software problems CHECK THE SOFTWARE DOCUMENTATION OR CONTACT THE SOFTWARE MANUFACTURER FOR TROUBLESHOOTING the device drivers do not conflict - Dell OptiPlex 755 | User's Guide - Page 338
type of memory supported by your computer, see the specifications for your computer. • Run the Dell Diagnostics (see "Dell Diagnostics" on page 353). Mouse Problems CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. CHECK - Dell OptiPlex 755 | User's Guide - Page 339
Problems Troubleshooting Power Problems . CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. I F T H E P O W E R L I G H T I S G R E E N A N D T H E C O M P U T E R I S N O T R E S P O N D I N G - See "Diagnostic Lights - Dell OptiPlex 755 | User's Guide - Page 340
section, follow the safety instructions in the Product Information Guide. If your mini tower, desktop, or small form factor computer has been certified for ENERGY STAR® 4.0, then your power supply is equipped with a self-test feature to help with troubleshooting power problems. The self-test feature - Dell OptiPlex 755 | User's Guide - Page 341
the system board and all internal devices. The procedure for disconnecting the power supply cables depends on the form factor of your computer: • For the mini tower, see "Power Supply" on page 79 • For the desktop, see "Power Supply" on page 155 • For the small form factor, see "Power Supply" on - Dell OptiPlex 755 | User's Guide - Page 342
- SEE THE PRINTER DOCUMENTATION FOR INFORMATION ON REINSTALLING THE PRINTER DRIVER. - Scanner Problems CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. NOTE: If you need technical assistance for your scanner, contact - Dell OptiPlex 755 | User's Guide - Page 343
fluorescent lights, or halogen lamps to check for interference. RUN THE SPEAKER DIAGNOSTICS R E I N S T A L L T H E S O U N D D R I V E R - See "Drivers" on page 356. R U N TH E H A R D W A R E TR O U B L E S H O O T E R - See "Troubleshooting Software and Hardware Problems in the Microsoft® Windows - Dell OptiPlex 755 | User's Guide - Page 344
instructions in the Product Information Guide. The power button light located on the front of the computer illuminates and blinks or remains solid to indicate different states: • If the power light is green and the computer is not responding, see "Diagnostic Lights" on page 347. • If the power light - Dell OptiPlex 755 | User's Guide - Page 345
to the system board (see the "System Board Components" section for your computer). • If the power light is steady amber, a device may be malfunctioning or incorrectly installed. - Remove and then reinstall the memory modules (see "Memory" on page 313). - Remove and then reinstall any cards (see the - Dell OptiPlex 755 | User's Guide - Page 346
problem was detected while the BIOS was executing. See "Beep Codes" on page 350 for instructions on diagnosing the beep code. Also, check the diagnostic lights to see if the specific problem is identified (see "Diagnostic Lights" on page 347). Solid green power light and no beep code and no video - Dell OptiPlex 755 | User's Guide - Page 347
a possible pre-BIOS failure has occurred. The diagnostic lights are not lit after the computer successfully boots to the operating system. • Plug the computer into a working electrical outlet (see "Power Problems" on page 339). • If the problem persists, contact Dell (see "Contacting Dell" on page - Dell OptiPlex 755 | User's Guide - Page 348
no special requirements for memory module/connector placement exist (see "Memory" on page 313). • Ensure that the memory you are using is supported by your computer (see the "Specifications" section for your computer). • If the problem persists, contact Dell (see "Contacting Dell" on page 370). 348 - Dell OptiPlex 755 | User's Guide - Page 349
normally, troubleshoot the last card removed from the computer for resource conflicts (see "Troubleshooting Software and Hardware Problems in the Microsoft® Windows® XP and Microsoft Windows Vista® Operating Systems" on page 358). 4 If the problem persists, contact Dell (see "Contacting Dell" on - Dell OptiPlex 755 | User's Guide - Page 350
burst of three beeps, and then one beep. This beep code tells you that the computer encountered a memory problem. Reseating the memory modules may correct the following beep code errors. If the problem persists, contact Dell (see "Contacting Dell" on page 370) for instructions on obtaining technical - Dell OptiPlex 755 | User's Guide - Page 351
Search for video ROM failure No timer tick Shutdown failure Gate A20 failure Unexpected interrupt in protected mode Memory failure above address 0FFFFh Timer-chip counter 2 failure Time-of-day clock stopped Serial or parallel port test failure Failure to decompress code to shadowed memory Math - Dell OptiPlex 755 | User's Guide - Page 352
INTR2 Error Invalid Boot Diskette Possible Cause An error is occurring on the timer on the system board. The system configuration information in the system setup program is incorrect or the battery charge may be low. Corrective Action See "Contacting Dell" on page 370 for instructions on obtaining - Dell OptiPlex 755 | User's Guide - Page 353
in this section, follow the safety instructions located in the Product Information Guide. When to Use the Dell Diagnostics If you experience a problem with your computer, perform the checks in this section and run the Dell Diagnostics before you contact Dell for technical assistance. It is - Dell OptiPlex 755 | User's Guide - Page 354
down any error codes and problem descriptions exactly as they appear and follow the instructions on the screen. 8 After all tests have completed, close the test window to return to the Dell Diagnostics Main Menu. 9 Close the Main Menu window to exit the Dell Diagnostics and restart the computer - Dell OptiPlex 755 | User's Guide - Page 355
error code and problem description and follow the instructions on the screen. If you cannot resolve the error condition, contact Dell (see "Contacting Dell" on page 370). NOTE: The Service Tag for your computer is located at the top of each test screen. If you contact Dell, technical support will - Dell OptiPlex 755 | User's Guide - Page 356
, such as the keyboard driver, come with your Microsoft Windows operating system. You may need to install drivers if you: • Upgrade your operating system. • Reinstall your operating system. • Connect or install a new device. Identifying Drivers If you experience a problem with any device, identify - Dell OptiPlex 755 | User's Guide - Page 357
at support.dell.com and your Drivers and Utilities media provide approved drivers for Dell™ computers. If you install drivers obtained from other sources, your computer might not work correctly. Using Windows Device Driver Rollback If a problem occurs on your computer after you install or update - Dell OptiPlex 755 | User's Guide - Page 358
type of device for which you are installing the driver (for example, Audio or Video). 3 Double-click the name of the device for which you are installing the driver. 4 Click the Driver tab→ Update Driver. 5 Click Install from a list or specific location (Advanced)→ Next. 6 Click Browse and browse to - Dell OptiPlex 755 | User's Guide - Page 359
problem and click Next to follow the remaining troubleshooting steps. Windows Vista: 1 Click the Windows Vista start button , and click Help and Support. 2 Type hardware troubleshooter • Dell PC Restore by Symantec (available in Windows XP) and Dell Factory Image Restore (available in Windows Vista) - Dell OptiPlex 755 | User's Guide - Page 360
System Restore; regardless of low disk space. Therefore, the steps below apply only to Windows XP. If you reinstall Windows XP with less than 200 MB of free hard-disk space available, System Restore is System Restore tab and ensure that Turn off System Restore is unchecked. 360 Solving Problems - Dell OptiPlex 755 | User's Guide - Page 361
and so on. If possible, back up all data before using PC Restore or Factory Image Restore. Windows XP: Dell PC Restore Using PC Restore: 1 Turn on the computer. During the boot process, a blue bar with www.dell.com appears at the top of the screen. 2 Immediately upon seeing the blue bar, press - Dell OptiPlex 755 | User's Guide - Page 362
Microsoft Windows Explorer, go to c:\dell\utilities\ Disk (C) in Windows Explorer, click Properties window and restart the computer. Windows Vista: Dell Factory Image Restore 1 Turn on the computer. When the Dell logo appears, press several times to access the Vista Advanced Boot Options window - Dell OptiPlex 755 | User's Guide - Page 363
The options can overwrite files and possibly affect programs that are installed on your hard drive. Therefore, do not reinstall Windows XP unless a Dell technical support representative instructs you to do so. 1 Save and close any open files and exit any open programs. 2 Insert the Operating System - Dell OptiPlex 755 | User's Guide - Page 364
the computer. When the DELL logo appears, press immediately. NOTE: If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft® Windows® desktop; then, shut down your computer and try again. NOTE: The next steps change the boot sequence for one time - Dell OptiPlex 755 | User's Guide - Page 365
installation and troubleshooting procedures. 5 If the preceding steps have not resolved the problem, contact Dell. NOTE: Call the support service from a telephone near or at the computer so that the support staff can assist you with any necessary procedures. NOTE: Dell's Express Service Code system - Dell OptiPlex 755 | User's Guide - Page 366
com (Asian/Pacific countries only) [email protected] (Canada only) AutoTech Service Dell's automated support service-AutoTech-provides recorded answers to the questions most frequently asked by Dell customers about their portable and desktop computers. When you call AutoTech, use your touch-tone - Dell OptiPlex 755 | User's Guide - Page 367
that are missing any of the preceding requirements will be refused at Dell's receiving dock and returned to you. Before You Call NOTE: Have your Express Service Code ready when you call. The code helps Dell's automated-support telephone system direct your call more efficiently. You may also be asked - Dell OptiPlex 755 | User's Guide - Page 368
detailed information during operations, or try other troubleshooting steps possible only at the computer itself. Ensure that the computer documentation is available. CAUTION: Before working inside your computer, follow the safety instructions in your Product Information Guide. 368 Getting Help - Dell OptiPlex 755 | User's Guide - Page 369
of the system's start-up files. If the computer is connected to a printer, print each file. Otherwise, record the contents of each file before calling Dell. Error message, beep code, or diagnostic code: Description of problem and troubleshooting procedures you performed: Getting Help 369 - Dell OptiPlex 755 | User's Guide - Page 370
-WWW.DELL (800.999.3355). Dell provides several online and telephone-based support and service options. Availability varies by country and product, and some services may not be available in your area. To contact Dell for sales, technical support, or customer service issues: 1 Visit support.dell.com - Dell OptiPlex 755 | User's Guide - Page 371
products from parts and components that are new or equivalent to new in accordance with industry-standard practices. For information about the Dell warranty for your computer, see the Product Information Guide or separate paper warranty document that shipped with your computer. Warranty 371 - Dell OptiPlex 755 | User's Guide - Page 372
372 Warranty - Dell OptiPlex 755 | User's Guide - Page 373
's instruction manual, may Dell™ OptiPlex™ 755 • Model numbers: DCTR, DCNE, DCSM, DCCY • Company name: Dell Inc. Worldwide Regulatory Compliance & Environmental Affairs One Dell Way Round Rock, TX 78682 USA 512-338-4400 NOTE: For Further regulatory information, see your Product Information Guide - Dell OptiPlex 755 | User's Guide - Page 374
374 FCC Notices (US Only) - Dell OptiPlex 755 | User's Guide - Page 375
specification that enables Microsoft® Windows® operating systems to put a computer in standby or hibernate mode to conserve the amount of electrical power allocated to each device attached to the computer. AGP - accelerated graphics port - A dedicated graphics port that allows system memory - Dell OptiPlex 755 | User's Guide - Page 376
a 4-bit prefetch and other architectural changes to boost memory speed to over 400 MHz. device - Hardware such as a disk drive, printer, or keyboard that is installed in or connected to your computer. device driver - See driver. DIMM - dual in-line memory module - A circuit board with memory chips - Dell OptiPlex 755 | User's Guide - Page 377
specific group of users. A user logs on to the domain to gain access to the resources. DRAM - dynamic random-access memory - Memory that stores information in integrated circuits containing capacitors. driver expansion card - A circuit board that installs in an expansion slot on the system board in - Dell OptiPlex 755 | User's Guide - Page 378
I/O card adhering to the PCMCIA standard. Modems and network adapters are common types of ExpressCards. ExpressCards support both the PCI Express and USB 2.0 standard. Express Service Code - A numeric code located on a sticker on your Dell™ computer. Use the Express Service Code when contacting Dell - Dell OptiPlex 755 | User's Guide - Page 379
computer, audio, and video equipment. board. Also referred to as built-in. I/O - input/output - An operation or device that enters and extracts data from your computer. Keyboards and printers are I/O devices. I/O address - An address in RAM that is associated with a specific device (such as a serial - Dell OptiPlex 755 | User's Guide - Page 380
the computer. Your computer can contain several different forms of memory, such as RAM, ROM, and video memory. Frequently, the word memory is used as a synonym for RAM. memory address - A specific location where data is temporarily stored in RAM. memory mapping - The process by which the computer - Dell OptiPlex 755 | User's Guide - Page 381
are common types of PC Cards. PCI - peripheral component interconnect - PCI is a local bus that supports 32-and 64-bit data paths, providing a high-speed data path between the processor and devices such as video, drives, and networks. PCI Express - A modification to the PCI interface that boosts the - Dell OptiPlex 755 | User's Guide - Page 382
- real time clock - Battery-powered clock on the system board that keeps the date and time after you shut down the computer. RTCRST - real-time clock reset - A jumper on the system board of some computers that can often be used for troubleshooting problems. S SAS - serial attached SCSI - A faster - Dell OptiPlex 755 | User's Guide - Page 383
the video controller and its drivers, and the amount of video memory installed in the computer. S-video TV-out - A connector used to attach a TV or digital audio device to the computer. SXGA - super-extended graphics array - A video standard for video cards and controllers that supports resolutions - Dell OptiPlex 755 | User's Guide - Page 384
video cards and controllers that supports resolutions up to 1600 x 1200. V video controller - The circuitry on a video card or on the system board (in computers with an integrated video controller) that provides the video capabilities-in combination with the monitor-for your computer. video memory - Dell OptiPlex 755 | User's Guide - Page 385
Z ZIF - zero insertion force - A type of socket or connector that allows a computer chip to be installed or removed with no stress applied to either the chip or its socket. Zip - A popular data compression format. Files that have been compressed with the Zip format are called Zip files and usually - Dell OptiPlex 755 | User's Guide - Page 386
386 Glossary
-
1 -
2 -
3 -
4 -
5 -
6 -
7 -
8
-
9
-
10
-
11
-
12
-
13
-
14
-
15
-
16
-
17
-
18
-
19
-
20
-
21
-
22
-
23
-
24
-
25
-
26
-
27
-
28
-
29
-
30
-
31
-
32
-
33
-
34
-
35
-
36
-
37
-
38
-
39
-
40
-
41
-
42
-
43
-
44
-
45
-
46
-
47
-
48
-
49
-
50
-
51
-
52
-
53
-
54
-
55
-
56
-
57
-
58
-
59
-
60
-
61
-
62
-
63
-
64
-
65
-
66
-
67
-
68
-
69
-
70
-
71
-
72
-
73
-
74
-
75
-
76
-
77
-
78
-
79
-
80
-
81
-
82
-
83
-
84
-
85
-
86
-
87
-
88
-
89
-
90
-
91
-
92
-
93
-
94
-
95
-
96
-
97
-
98
-
99
-
100
-
101
-
102
-
103
-
104
-
105
-
106
-
107
-
108
-
109
-
110
-
111
-
112
-
113
-
114
-
115
-
116
-
117
-
118
-
119
-
120
-
121
-
122
-
123
-
124
-
125
-
126
-
127
-
128
-
129
-
130
-
131
-
132
-
133
-
134
-
135
-
136
-
137
-
138
-
139
-
140
-
141
-
142
-
143
-
144
-
145
-
146
-
147
-
148
-
149
-
150
-
151
-
152
-
153
-
154
-
155
-
156
-
157
-
158
-
159
-
160
-
161
-
162
-
163
-
164
-
165
-
166
-
167
-
168
-
169
-
170
-
171
-
172
-
173
-
174
-
175
-
176
-
177
-
178
-
179
-
180
-
181
-
182
-
183
-
184
-
185
-
186
-
187
-
188
-
189
-
190
-
191
-
192
-
193
-
194
-
195
-
196
-
197
-
198
-
199
-
200
-
201
-
202
-
203
-
204
-
205
-
206
-
207
-
208
-
209
-
210
-
211
-
212
-
213
-
214
-
215
-
216
-
217
-
218
-
219
-
220
-
221
-
222
-
223
-
224
-
225
-
226
-
227
-
228
-
229
-
230
-
231
-
232
-
233
-
234
-
235
-
236
-
237
-
238
-
239
-
240
-
241
-
242
-
243
-
244
-
245
-
246
-
247
-
248
-
249
-
250
-
251
-
252
-
253
-
254
-
255
-
256
-
257
-
258
-
259
-
260
-
261
-
262
-
263
-
264
-
265
-
266
-
267
-
268
-
269
-
270
-
271
-
272
-
273
-
274
-
275
-
276
-
277
-
278
-
279
-
280
-
281
-
282
-
283
-
284
-
285
-
286
-
287
-
288
-
289
-
290
-
291
-
292
-
293
-
294
-
295
-
296
-
297
-
298
-
299
-
300
-
301
-
302
-
303
-
304
-
305
-
306
-
307
-
308
-
309
-
310
-
311
-
312
-
313
-
314
-
315
-
316
-
317
-
318
-
319
-
320
-
321
-
322
-
323
-
324
-
325
-
326
-
327
-
328
-
329
-
330
-
331
-
332
-
333
-
334
-
335
-
336
-
337
-
338
-
339
-
340
-
341
-
342
-
343
-
344
-
345
-
346
-
347
-
348
-
349
-
350
-
351
-
352
-
353
-
354
-
355
-
356
-
357
-
358
-
359
-
360
-
361
-
362
-
363
-
364
-
365
-
366
-
367
-
368
-
369
-
370
-
371
-
372
-
373
-
374
-
375
-
376
-
377
-
378
-
379
-
380
-
381
-
382
-
383
-
384
-
385
-
386
 |
 |
www.dell.com | support.dell.com
Dell™ OptiPlex™ 755
User’s Guide
Models: DCTR, DCNE, DCSM, and DCCY