HP dx7400 Service Reference Guide - HP Compaq dx7400 Business PC
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- HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 1
Service Reference Guide HP Compaq dx7400 Business PC - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 2
change without notice. Microsoft and Windows are trademarks of Microsoft Corporation in the U.S. and other countries. The only warranties for HP products and services to another language without the prior written consent of Hewlett-Packard Company. Service Reference Guide Business PCs First Edition - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 3
About This Book WARNING! Text set off in this manner indicates that failure to follow directions could result in bodily harm or loss of life. CAUTION: Text set off in this manner indicates that failure to follow directions could result in damage to equipment or loss of information. NOTE: Text set - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 4
iv About This Book - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 5
Table of contents 1 Installing and Customizing the Software Installing the Operating System ...1 Installing or Upgrading Device Drivers 2 HP Backup and Recovery Manager ...2 2 Computer Setup (F10) Utility Computer Setup (F10) Utilities ...3 Using Computer Setup (F10) Utilities 3 Computer Setup- - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 6
Client Foundation Suite 24 HP OpenView Client Configuration Manager 25 HP OpenView PC Configuration Management Solution 25 HP Client Catalog for SMS 25 HP Backup and Recovery Manager 26 Intel vPro-branded PCs with Active Management Technology 27 HP Proactive Change Notification 28 Subscriber - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 7
53 Cleaning the Mouse ...54 Service Considerations ...54 Power Supply Fan ...54 Tools and Software Requirements 54 Screws ...54 Cables and Connectors ...55 Hard Drives ...55 Lithium Coin Cell Battery 55 7 Removal and Replacement Procedures Microtower (MT) Chassis Preparation for Disassembly ...56 - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 8
Memory ...99 DDR2-SDRAM DIMMs ...99 Replacing Memory ...99 Expansion Card ...101 Serial Port ...103 ReadyBoost Card ...104 Plastic Wire/Cable Fastener and Clips 105 Front I/O Device ...106 Power Switch Assembly ...107 Speaker ...108 Heatsink ...109 Heatsink Fan ...110 Processor ...111 Power Supply - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 9
Power (for CPU) ...125 SATA Data and Power ...126 PCI Express ...126 PCI Express ...127 DVI Connector ...128 Appendix B Power Cord Set Requirements General Requirements ...129 Japanese Power Cord Requirements 129 Country-Specific Requirements ...130 Appendix C POST Error Messages POST Numeric Codes - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 10
...152 Solving Media Card Reader Problems 154 Solving Display Problems ...156 Solving Audio Problems ...159 Solving Printer Problems ...161 Solving Keyboard and Mouse Problems 162 Solving Hardware Installation Problems 163 Solving Network Problems ...165 Solving Memory Problems ...168 Solving - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 11
1 Installing and Customizing the Software NOTE: If the computer was shipped with Microsoft Windows Vista loaded, you will be prompted to register the computer with HP Total Care before installing the operating system. You will see a brief movie followed by an online registration form. Fill out the - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 12
action points the operating system to the appropriate drivers. Obtain the latest support software, including support software for the operating system from http://www.hp.com/support. Select your country and language, select Download drivers and software, enter the model number of the computer, and - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 13
factory default settings. ● Set the system date and time. ● Set, view, change, or verify the system configuration, including settings for processor, graphics, memory, audio, storage, communications, and input devices. ● Modify the boot order of bootable devices such as hard drives, diskette drives - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 14
key. CAUTION: Do NOT turn the computer power OFF while the ROM is saving the Computer Setup (F10) changes because the CMOS could become corrupted. It Setup-Boot on page 9 PC Health Table 2-6 Computer Setup-PC Health on page 10 Exit Computer Setup-Exit on page 10 4 Chapter 2 Computer Setup - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 15
Computer Setup-System Information NOTE: Support for specific Computer Setup options may vary depending on the hardware configuration. Table 2-2 Computer Setup-System Information Option Description Product Name (view only) SKU Number (view only) Processor Type (view only) Processor Speed - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 16
Support for specific Computer Setup options may vary depending on the hardware configuration. Table 2-3 Computer Setup-Main Option Description Date (mm:dd:yy) Allows you to set system date Head ◦ Precomp ◦ Landing Zone ◦ Sector Onboard FDC Controller Disables/enables the floppy disk controller - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 17
display device: (VGA Setting) ● PCI Slot ● OnChipVGA ● PCIEx Onboard HD Audio Disables/enables onboard HD audio. OnChip USB Controller Disables/enables USB controller. USB Legacy Support Disables/enables USB legacy support function (USB keyboard, USB mouse, and USB flash media). Onboard LAN - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 18
● ECP+EPP ● Normal After AC Power Loss Allows you to select system power loss behavior: ● On ● Off ● Last State Wake on PCI Device from S5 Disables/enables waking up from S5 by PCI device. RTC Alarm Resume Disables/enables RTC (real-time clock) alarm. Date (of Month) If RTC Alarm Resume - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 19
Computer Setup-Boot NOTE: Support for specific Computer Setup options may vary depending on the hardware configuration. Table 2-5 Computer Setup-Boot Option Description Device Boot Disabling Allows disabling of bootable device groups. Choose from: ● None ● USB ● Internal ODD ● Internal FDD ● - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 20
Write Protection Enables/disables to prevent the BIOS from being updated. Computer Setup-PC Health NOTE: Support for specific Computer Setup options may vary depending on the hardware configuration. Table 2-6 Computer Setup-PC Health Option Description System Fan Fail Check Disables/enables - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 21
Save/Load utility can be found at http://www.hp.com under the Software & Driver Downloads for your specific model. Download the firmware files into a folder on a removable storage device. It is recommended that you save any modified computer configuration settings to a diskette, a USB flash media - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 22
The Survey tab is displayed when you invoke HP Insight Diagnostics. This tab shows the current configuration of the computer. From to the Customer Support Center. NOTE: Third party devices may not be detected by HP Insight Diagnostics. Accessing HP Insight Diagnostics To access HP Insight Diagnostics - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 23
select the following categories of information to display: All-Gives a listing of all categories of information about the computer. Overview-Gives you a listing of general information about the computer. Architecture-Provides system BIOS and PCI device information. Asset Control-Shows product name - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 24
of a system. The Custom Test mode allows you to specifically select which devices, tests, and test parameters are run. For each test type, there are two test modes to choose from: ● Interactive Mode-Provides maximum control over the testing process. The diagnostic software will prompt you for input - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 25
tab contains an HP Insight Diagnostics tab, an Error Codes tab, and a Test Components tab. The HP Insight Diagnostics tab problem. To find an error code description quickly, enter the code in the box at the top of the tab and click the Find Error Codes button. The Test Components tab displays - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 26
Click the Software & Driver Downloads link. 3. Enter your product number (for example, dc7700) in the text box and press the Enter key. 4. Select your specific computer model. 5. Select your OS. 6. Click the Diagnostic link. 7. Click HP Insight Diagnostics Offline Edition. 8. Select a language and - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 27
Backup and Recovery Manager, refer to the HP Backup and Recovery Manager User Guide by selecting Start > HP Backup and Recovery > HP Backup and Recovery Manager Manual. NOTE: You can order a Recovery Disc Set from HP by calling the HP support center. Go to the following Web site, select your region - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 28
and features of desktop management are: ● Initial configuration and deployment ● Remote system installation ● Software updating and management ● ROM flash ● Hardware option configuration ● Asset tracking and security ● Fault notification and recovery NOTE: Support for specific features described in - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 29
of system software, configuration management and troubleshooting, and power management. HP OpenView Agent NOTE: HP OpenView Agent is not currently available for Windows Vista. The management agent used by both HP OpenView Client Configuration Manager and HP OpenView PC Configuration Management - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 30
Service Boot message appears in the lower-right corner of the HP logo screen when the computer is booting up. Follow the instructions on the screen to continue the process. The default boot order is a BIOS configuration setting that can be changed to always attempt to PXE boot. 20 Chapter 4 Desktop - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 31
instructions on the screen to continue the process. The default boot order is a BIOS configuration setting that can be changed to always attempt to PXE boot. Software Updating and Management HP provides several tools for managing and updating software on desktops, workstations, and notebooks: ● HP - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 32
. For more information on HP Client Management Interface, refer to http://www.hp.com/go/hpcmi/. HP System Software Manager HP System Software Manager (SSM) is a free utility that automates remote deployment of device drivers and BIOS updates for your networked HP business PCs. When SSM runs, it - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 33
drivers and BIOS updates without visiting each PC ● Remotely configure BIOS and security settings ● Automate processes to quickly resolve hardware problems Tight integration with HP Instant Support tools reduces hardware troubleshooting time. ● Diagnostics-remotely run & view reports on HP desktop - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 34
software provides security features that help protect against unauthorized access to the computer, networks, and critical data. Enhanced security functionality is provided by the following modules: ● Smart Card Security for ProtectTools ● Embedded Security for ProtectTools ● BIOS Configuration - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 35
free product for managing HP desktops, notebooks and workstations, providing hardware and software inventory, remote control, HP alert monitoring, HP BIOS and driver updates, integration with HP Protect Tools and add-on support for Intel AMT. The Basic Edition also supports deployment and management - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 36
Server management infrastructure. The HP Client Catalog for SMS contains software driver and patch information for desktop, mobile and workstation platforms. With SMS 2003 R2 and Inventory Tool for Custom Updates, organizations can integrate and deploy HP software updates quickly and easily, based - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 37
. For HP-specific information on Intel vPro technology, see the white papers at http://www.hp.com/ support. Select your country and language, select See support and troubleshooting information, enter the model number of the computer, and press Enter. In the Resources category, click Manuals (guides - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 38
-allows administrator to provide pre-provisioning key (see HP's white paper, Intel vPro Provisioning) ◦ Un-Provision-allows administrator to reset AMT configuration to factory defaults ◦ VLAN-allows administrator to enable LAN virtualization support ◦ SOL/IDE-R-allows administrator to enable remote - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 39
ROM from being unintentionally updated or overwritten. This is important to ensure the operating integrity of the computer. Should you need or want to upgrade the BIOS, you may download the latest BIOS images from the HP driver and support page, http://www.hp.com/support/files. CAUTION: For maximum - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 40
of multiple computers. NOTE: Both procedures require a diskette drive or a supported USB flash media device, such as an HP Drive Key. Copying to Single Computer CAUTION: A setup configuration is model-specific. File system corruption may result if source and target computers are not the - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 41
PC. This method takes a little longer to prepare the configuration diskette or USB flash media device, but copying the configuration to target computers is significantly faster. NOTE: A bootable diskette is required for this procedure or to create a bootable USB flash media device. If Windows XP - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 42
instructions on the screen to create the configuration diskette or USB flash media device. 8. Download a BIOS utility for replicating setup (repset.exe) and copy it onto the configuration diskette or USB flash media device. To obtain this utility, go to http://welcome.hp.com/country/us/en/ support - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 43
drive (for example, the system's internal hard drive). 10. At the A:\ prompt, enter FORMAT /S X: where X represents the drive letter noted before. CAUTION: Be sure that you have entered the correct drive letter for the USB flash media device. FORMAT will display one or more warnings and ask you each - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 44
, if necessary. 15. Go to Advanced > PCI Devices and re-enable the PATA and SATA controllers that were disabled in step 6. Put the SATA controller on its original IRQ. 16. Save the changes and exit. The computer will boot to the USB flash media device as drive C. 34 Chapter 4 Desktop Management - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 45
installing the latest support software easier. You can download the software from http://www.hp.com/support. The Web site contains the latest device drivers, utilities, and flashable ROM images needed to run the latest Microsoft Windows operating system on the HP computer. Dual-State Power Button 35 - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 46
valuable data assets. Memory Change and Smart Cover Sensor Guide on the Documentation and Diagnostics CD included with the computer for additional information and instructions on using the Computer Setup Utilities. Some computers also have HP BIOS Configuration for ProtectTools, which is a Windows - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 47
feature is supported on some models only. See the HP ProtectTools Security Manager Guide at http://www.hp.com Device Security Enables/disables serial ports, parallel port, front USB ports, system audio, network controllers (some models), and SCSI controllers (some models). Network Service Boot - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 48
about Computer Setup, see the Computer Setup (F10) Utility Guide on the Documentation and Diagnostics CD. Support for security features may vary depending on the specific computer configuration. Password Security The power-on password prevents unauthorized use of the computer by requiring entry - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 49
-On Password and follow the instructions on the screen. 4. Before exiting, click File > Save Changes and Exit. Entering a Power-On Password To enter a power-on password, complete the following steps: 1. Turn on or restart the computer. If you are in Windows, click Start > Shut Down > Restart the - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 50
with an embedded security device, refer to the HP ProtectTools Security Manager Guide at http://www.hp.com. 1. Turn on or restart the computer. If you are in Windows, click Start > Shut Down > Restart the Computer. 2. To change the Power-On password, go to step 3. To change the Setup password, as - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 51
-specific requirements. The syntax and keys that you use to change Troubleshooting Guide on the Documentation and Diagnostics CD for instructions on clearing passwords. If the system is equipped with an embedded security device, refer to the HP ProtectTools Security Manager Guide at http://www.hp - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 52
the device. If a power-on password is set and it matches the device's Windows, if neither attempt succeeds, POST will halt and the user will be instructed to cycle power software, other asset control functions, and support. For users with less stringent security requirements, HP displays a message - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 53
the computer is restarted, the screen displays a message indicating that the computer Changes and Exit. Smart Cover Lock The Smart Cover Lock is a software-controllable cover lock featured on some HP Turn on or restart the computer. If you are in Windows, click Start > Shut Down > Restart. 2. As soon - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 54
with managing corporate networks. Affordably priced, it is not just for high-tech, high-security organizations anymore. NOTE: Support for Fingerprint Identification Technology varies by model. For more information, visit: http://h18004.www1.hp.com/products/security/. 44 Chapter 4 Desktop Management - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 55
help diagnose conditions that caused you to run the DPS software. Refer to the Troubleshooting Guide on the Documentation and Diagnostics CD for instructions on using DPS. Surge-Tolerant Power Supply An integrated surge-tolerant power supply provides greater reliability when the computer is hit with - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 56
ATA (PATA) drives are supported. SATA Hard Drives Serial ATA Hard Drive Characteristics Number of pins/conductors in data cable Number of pins in power cable Maximum data cable length Data interface voltage differential Drive voltages Jumpers for configuring drive Data transfer rate 7/7 15 - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 57
computer specification. Drive size calculations by drive manufacturers are bytes to the base 10 while calculations by Microsoft are bytes to the base 2. File System FAT 32 NTFS Drive/Partition Capacity Limits Controller Type ATA ATA Operating System Windows 2000/XP/Vista Windows 2000/XP/Vista - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 58
the system board. You must disconnect the power cord from the power source before opening the computer to prevent system board or component damage. Chassis Designations The following subsection illustrates the dx7400 chassis design. Microtower (MT) 48 Chapter 6 Identifying the Chassis, Routine Care - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 59
Networks built into many integrated circuits provide some protection, but in many cases, the discharge contains enough power to alter device bubble pack from PCB 55% 7,500 V 3,000 V 400 V 400 V 2,000 V 3,500 V 7,000 V Relative Humidity 40% 15,000 V 5,000 V 800 V 700 V 4,000 V 5,000 V 20,000 V 10% - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 60
Packing PCBs in foam-lined box 5,000 V *These are then multi-packaged inside plastic tubes static electricity damage to equipment: ● Wrist straps are flexible straps with a maximum of one-megohm ± 10% resistance in the ground cords. To provide proper ground, a strap must be worn snug against bare - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 61
. Handle them only at static-free work areas. ● Turn off power and input signals before inserting and removing connectors or test equipment. ● to ground ● Field service kits ● Static awareness labels ● Wrist straps and footwear straps providing one-megohm +/- 10% resistance ● Material handling - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 62
computer on a sturdy, level surface. Leave a 10.2-cm (4-inch) clearance on all vented sides of keyboard feet down, directly against the front of the desktop unit as this also restricts airflow. ● Occasionally clean enable power management functions of the operating system or other software, including - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 63
on page 52. When cleaning debris from under the keys, review all rules in General Cleaning Safety Precautions on page 52 before key puller to prevent damage to the keys. This tool is available through many electronic supply outlets. CAUTION: Never remove a wide leveled key (like the space bar) from - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 64
or "Off" modes. You must disconnect the power cord from the power source before opening the computer to prevent system board or component damage. Tools and Software Requirements To service the computer, you need the following: ● Torx T-15 screwdriver (HP screwdriver with bits, PN 161946-001) ● Torx - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 65
servicing this in a bubble-pack mailer or mounted in the CPU. ● Avoid power to the real-time clock and has a minimum lifetime of about three years. See the appropriate removal and replacement chapter for the chassis you are working on in this guide for instructions Batteries, battery packs, and - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 66
is in the "Standby," or "Suspend" modes. The power cord should always be disconnected before servicing a unit. 5. Disconnect the power cord from the electrical outlet and then from the computer. 6. Disconnect all peripheral device cables from the computer. NOTE: During disassembly, label each - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 67
(Preparation for Disassembly on page 56). 2. Remove the two screws that secure the access panel to the computer chassis (1). 3. Slide the access panel back about 1.25 cm (1/2 inch), and then lift it away from and off the unit (2). To replace the access panel, reverse the removal steps. Access - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 68
chassis (2), beginning with the left side then the right side. To reinstall the front bezel, reverse the removal procedure. 58 Chapter 7 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 69
Bezel Blanks 1. Prepare the computer for disassembly (Preparation for Disassembly on page 56). 2. Remove the access panel (Access Panel on page 57). 3. Remove the front bezel (Front Bezel on page 58). 5.25-inch Drive Bezel Blank While facing the inside of the front bezel, press the two retaining - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 70
bezel blank, press the blank inward from the inside of the front bezel so that it snaps into place. 60 Chapter 7 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 71
and x16 DDR devices; DIMMs constructed with x4 SDRAM are not supported NOTE: The system will not start if you install unsupported DIMMs. Installing Memory Modules CAUTION: The memory module sockets have gold metal contacts. When upgrading the memory, it is important to use memory modules with gold - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 72
installed in only one way. Match the notch on the module with the tab on the memory socket. 4. Push the module down into the socket, ensuring that the module is fully To reassemble the computer, reverse the removal procedure. 62 Chapter 7 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 73
on the rear panel that covers the expansion slot. Be sure to remove the appropriate shield for the expansion card you are installing. Removable Shield Top shield Second shield Third shield Bottom shield Expansion Card Type PCI Express x16 PCI Express x1 PCI Express x1 PCI Expansion Cards 63 - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 74
To remove an expansion card, reverse the installation procedure. CAUTION: After removing an expansion card, you must replace it with a new card or expansion slot cover for proper cooling of internal components during operation. 64 Chapter 7 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 75
prefolded. Never change the folds on these cables. ● Do not bend any cable sharply. A sharp bend can break the internal wires. ● Never bend a SATA data cable tighter than a 30 mm (1.18 in) radius. ● Never crease a SATA data cable. ● Do not rely on components like the drive cage, power supply, or - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 76
Power Supply Power Supply Cable Power supply, 24-pin Power supply, 4-pin Diskette drive 1st SATA hard drive 2nd SATA hard drive Primary ODD Second ODD Heatsink fan Chassis fan Front power on button Front I/O USB Speaker Front audio Second Serial Port Media Card Reader To System board, 24-pin CPU - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 77
Drives The computer supports up to five drives that may be installed in various configurations. This section describes the procedure for replacing or upgrading the storage drives. A Torx T-15 screwdriver is needed to remove and install the guide screws on a drive. Drive Positions 1 External 5.25- - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 78
below when connecting drives to the system board. Drive Configuration 1 hard drive 1 optical drive 1 hard drive 2 1 optical drive 2 hard drives 2 optical drives media card reader diskette drive System Board Connectors primary hard drive: 7 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 79
Remove the front bezel (Front Bezel on page 58). 4. Disconnect the power and data cables from the back of the drive. 5. Remove the two retainer screws that secure the the front of the chassis. There are a total of eight extra guide/retainer screws on the front of the chassis behind the bezel. Four - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 80
device is a media card reader, disconnect the internal USB cable from the system board. If the device is a diskette drive, disconnect the power, and data cables from the back of the appropriate guide screws into the drive. 70 Chapter 7 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 81
Drive 1. Prepare the computer for disassembly (Preparation for Disassembly on page 56). 2. Remove the access panel (Access Panel on page 57). 3. Disconnect the power and data cables from the back the drive. 4. Remove the four retaining screws that secure the drive to the bay (1). 5. Slide the drive - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 82
56). 2. Remove the access panel (Access Panel on page 57). 3. Unplug the ReadyBoost cable from the system board, and then lift the card assembly from the chassis. To install the ReadyBoost card, reverse the removal procedure. 72 Chapter 7 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 83
the housing to the chassis, and then rotate the housing toward the top of the chassis and pull the assembly out of the chassis (2) while guiding the cables through the hole in the chassis. To install the housing assembly, reverse the removal procedures. Front I/O Panel Housing Assembly 73 - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 84
top of the switch holder (1), rotate the switch downward (2), and then pull it away from the chassis while guiding the wires through the hole in the chassis. To install the power switch assembly, reverse the removal procedures. 74 Chapter 7 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 85
Speaker 1. Prepare the computer for disassembly (Preparation for Disassembly on page 56). 2. Remove the access panel (Access Panel on page 57). 3. Remove the front bezel (Front Bezel on page 58). 4. Disconnect the speaker cable from the system board. 5. Free the cable from the cable tie that is - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 86
port to the chassis (2), and then remove the serial port. To install the serial port, reverse the removal procedure. 76 Chapter 7 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 87
the chassis (2). 5. Cut the tie-wrap (1) at the bottom of the fan that secures the CPU power cable (2) to the fan. To install the fan, reverse the removal procedures. NOTE: When installing the fan, the CPU power cable must be plugged into the system board before securing the cable to the bottom of - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 88
thermal grease already applied. Position the heatsink so that fan wiring is closest to the power supply. Check to ensure that the heatsink mounting lugs do not rest on any electrical components before replacing the system board. 78 Chapter 7 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 89
Processor 1. Prepare the computer for disassembly (Preparation for Disassembly on page 56). 2. Remove the access panel and lay the computer down on its side to make it easier to work on (Access Panel on page 57). 3. Disconnect the heatsink control cable from the system board and remove the heatsink - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 90
update the system ROM to ensure that the latest version of the BIOS is being used on the computer. The latest system ROM BIOS can be found on the Web at: http:///\h18000.www1.hp.com/support 58). 4. Disconnect the power, and data cables from the back of all installed drives. Microtower (MT) Chassis - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 91
system ROM to ensure that the latest version of the BIOS is being used on the computer. The latest system ROM BIOS can be found on the Web at: http:///\h18000.www1.hp.com/support/files. Battery The battery that comes with your computer provides power to the real-time clock and has a lifetime of - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 92
. When the battery is removed or replaced, the CMOS settings will be cleared. Refer to the Troubleshooting Guide for information on backing up the CMOS settings. NOTE: Batteries, battery packs, and accumulators should not be disposed of together with the general household waste. In order to forward - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 93
panel. 4. Plug in the computer and turn on power to the computer. 5. Reset the date and time, your passwords, and any special system setups, using Computer Setup. Refer to the Computer Setup (F10) Utility Guide. Type 3 Battery Holder 1. Pull back on the clip (1) that holds the battery in place - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 94
all power cables from the mass storage devices and from the system board. 4. Cut the tie wrap (1) at the bottom of the fan that secures the CPU power cable (2) to the fan cage. NOTE: If necessary, remove the fan to cut this tie. 84 Chapter 7 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 95
5. Remove the four screws (1) that secure the power supply to the chassis. 6. Slide the power supply toward the front of the computer, then lift it out of the computer. To install the power supply, reverse the removal procedure. NOTE: When attaching the CPU power cable to the system board, use the - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 96
Installing a Security Lock An optional security lock can be installed on the rear panel of the computer to provide physical computer security. NOTE: The security lock slot may be in a different location on your computer model. 86 Chapter 7 Removal and Replacement Procedures Microtower (MT) Chassis - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 97
in this guide are available on all computers. Preparation for Disassembly 1. Close any open software applications. power cord should always be disconnected before servicing a unit. 5. Disconnect the power cord from the electrical outlet and then from the computer. 6. Disconnect all peripheral device - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 98
(Preparation for Disassembly on page 87). 2. Remove the two screws that secure the access panel to the computer chassis (1). 3. Slide the access panel back about 1.25 cm (1/2 inch), then lift it away from and off the unit (2). To install the access panel, reverse the removal procedure. 88 - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 99
87). 2. Remove the access panel (Access Panel on page 88). 3. Pull up on each of the three tabs on the top of the bezel (1) to release them, and then rotate the bezel down and off the chassis (2). To install the front bezel, reverse the removal procedure. Front Bezel 89 - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 100
Drive Bezel Blank If the computer was not shipped with a device in the 3.5-inch bay, the bay will be covered by a bezel blank. If you install a device in the 3.5-inch bay, you must first remove the bezel blank place. 90 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 101
like the heatsink. ● Do not jam cables on top of expansion cards or memory modules. Printed circuit cards like these are not designed to take excessive pressure on them. ● Keep cables clear of movable or rotating parts like the power supply and drive cage to prevent them from being cut or crimped - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 102
Cable Connections System board connectors are color-coded to make it easier to find the proper connection. Cable Power Supply Power Supply Power Supply Power Supply Power Supply To Main power, 24-pin CPU power, 4-pin SATA Hard drive SATA Optical drive Diskette drive Cable Designator P1 P3 P4 P5 - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 103
remove and install the guide screws on a drive. Drive Positions (1) External 3.5-inch option drive bay for media card reader or diskette drive (2) Internal 3.5-inch bay for hard drive (3) External 5.25-inch optical drive bay To verify the type and size of the storage device installed in the computer - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 104
Follow the guidelines in the illustration and table below when connecting drives to the system board. Drive Configuration 1 hard drive 1 optical drive media card reader diskette drive System Board Connectors (1) SATA1 hard drive (2) SATA2 optical drive (3) USB connector (white) (4) FDD connector - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 105
panel (Access Panel on page 88). 3. Remove the front bezel (Front Bezel on page 89). 4. Rotate the drive cage to the upright position. 5. Disconnect the power and data cables from the back of the hard drive. 6. Remove the SATA cable from the clip on the bottom of the drive cage. Drives 95 - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 106
drive forward and out of the bay (2). NOTE: When replacing the drive, transfer the guide screws from the old drive to the new one. To install a drive, reverse the removal procedure. External 3.5-inch Media Card Reader or Diskette Drive The 3.5-inch external drive bay may be populated with a media - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 107
. 5. If the device is a media card reader, disconnect the internal USB cable from the system board. If the device is a diskette drive, disconnect the power and data cables from the back of the drive. A Torx T-15 screwdriver is needed to remove and install the guide screws on a hard drive. Drives 97 - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 108
Rotate the drive cage to the upright position. 5. Disconnect the power and data cables from the back of the hard drive. 6. Remove the two retainer screws drive back and out of the bay (2). To install a hard drive, reverse the above procedure. NOTE: When replacing a drive, transfer the guide screw - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 109
x8 and x16 DDR devices; DIMMs constructed with x4 SDRAM are not supported NOTE: The system will not start if you install unsupported DIMMs. Replacing Memory CAUTION: The memory module sockets have gold metal contacts. When upgrading the memory, it is important to use memory modules with gold metal - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 110
one way. Match the notch on the module with the tab on the memory socket. 5. Push the module down into the socket, ensuring that the want to install. NOTE: The computer automatically recognizes the additional memory when the computer is turned on. 100 Chapter 8 Removal and Replacement Procedures Small - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 111
from the slots (2). 5. If you are installing an expansion card for the first time, you must use a flat-blade card you are installing. Removable Shield Top shield Second shield Third shield Bottom shield Expansion Card Type PCI Express x16 PCI Express x1 PCI Express x1 PCI Expansion Card - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 112
down into the expansion socket on the system board. NOTE: When installing an expansion card, press firmly on the card so that the whole connector seats properly in the expansion card slot. 7. While holding the expansion card bracket against the chassis, rotate the slot cover lock over the expansion - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 113
(Preparation for Disassembly on page 87). 2. Remove the access panel (Access Panel on page 88). 3. Remove the cable from the clips on top of the power supply (1). 4. Remove the two hex nuts that secure the port to the chassis (2), and then remove the serial port from the chassis (3). To install the - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 114
is installed in the computer. The card is secured to the chassis, and a cable connects the card to the system board. 1. Prepare the cable from the system board, and then lift the card assembly from the chassis. To install the ReadyBoost card, reverse the removal procedure. 104 Chapter 8 Removal and - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 115
to gain access to the wires for several computer components. Additionally, many wires are routed through clips below the drive cage and on the power supply. See the following illustration for proper routing of these wires. To loosen the fastener on the chassis floor: 1. Prepare the computer for - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 116
). 4. Rotate the drive cage to its upright position. 5. Unplug the audio and USB cables from the system board. 6. Rotate the drive cage back down. 7. Remove the screw that secures the front I/O device to the chassis (1). 8. Rotate the device toward the right side of the chassis (when viewed from the - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 117
switch wires from the system board. 6. From the inside of the chassis, press the tab on the bottom of power button assembly to loosen the assembly (1). 7. If necessary, rotate the drive cage back down to gain access to the wires. 8. Pull the assembly out through front of unit (2) while threading the - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 118
the speaker wire. 5. Disconnect the speaker wire from the system board. 6. If necessary, remove expansion cards to gain access to the speaker. 7. Remove the screw that secures the speaker to the inside of procedures. 108 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 119
Heatsink 1. Prepare the computer for disassembly (Preparation for Disassembly on page 87). 2. Remove the access panel (Access Panel on page 88). 3. Unplug the fan wire from the system board. 4. Loosen the four captive screws (1) that secure the heatsink to the system board tray. CAUTION: Heatsink - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 120
then remove the fan from the heatsink (2). To install the heatsink fan, reverse the removal procedure. 110 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 121
spares kit. CAUTION: Before reinstalling the heatsink you must clean the top of the processor and the bottom of the heatsink with an alcohol pad supplied in the spares kit. After the alcohol has evaporated, apply thermal grease to the top of the processor from the syringe - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 122
the system ROM to ensure that the latest version of the BIOS is being used on the computer. The latest system BIOS can be found on the Web at: http://h18000.www1.hp.com/support/files. Power Supply 1. Prepare the computer for disassembly (Preparation for Disassembly on page 87). 2. Remove the access - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 123
the rotation of the drive cage or power supply. System Board 1. Prepare the computer for disassembly (Preparation for Disassembly on page 87). 2. Remove the access panel (Access Panel on page 88). 3. Remove all PCI and PCI Express expansion boards (Expansion Card on page 101). 4. Remove the optical - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 124
the heatsink with an alcohol pad supplied in the spares kit. After the alcohol has evaporated, top of the processor from the syringe supplied in the spares kit. NOTE: When reinstalling power supply. NOTE: When replacing the system board, you must also change the chassis serial number in the BIOS. - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 125
NOT connected to AC power. WARNING! This Guide for information on backing up the CMOS settings. NOTE: HP encourages customers to recycle used electronic hardware, HP original print cartridges necessary to remove an expansion card to gain access to the instructions to replace the battery: Battery 115 - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 126
on power to the computer. 6. Reset the date and time, your passwords, and any special system setups, using Computer Setup. Refer to the Computer Setup (F10) Utility Guide. Type 2 Battery Holder 1. To release the panel. 116 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 127
4. Plug in the computer and turn on power to the computer. 5. Reset the date and time, your passwords, and any special system setups, using Computer Setup. Refer to the Computer Setup (F10) Utility Guide. Type 3 Battery Holder 1. Pull back on the clip (1) that holds the battery in place, then remove - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 128
computer security. NOTE: The security lock slot may be in a different location on your computer model. 118 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 129
pin assignments for many computer and workstation connectors. Some of these connectors may not be used on the product being serviced. Keyboard Connector and Icon Pin Signal 1 Data 2 Unused 3 Ground 4 +5 VDC 5 Clock 6 Unused Mouse Connector and Icon Pin Signal 1 Data 2 Unused - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 130
RJ-45 Connector and Icon Ethernet AUI Connector and Icon Pin Signal 1 Ground 2 Negative AUI Differential Collision 6 (-) Receive Data 7 Unused 8 Unused Pin Signal 9 Positive AUI Differential Receive 10 +12V 11 Ground 12 Ground 13 Unused 14 Unused 15 Unused 16 Unused 120 - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 131
Data Bit 5 8 Data Bit 6 9 Data Bit 7 Pin Signal 10 Acknowledge 11 Busy 12 Paper End 13 Select 14 Auto Linefeed 15 Error 16 Initialize Printer 17 Select IN 18-25 Signal Ground Serial Interface, Powered and Non-Powered Connector and Icon Pin Signal 1 Carrier Detect (12V if - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 132
USB Connector and Icon Diskette Drive Power Connector and Icon 4 1 Microphone Connector and Icon (1/8" miniphone) 1 23 Headphone Connector and Icon (1/8" miniphone) 1 23 Line-in Audio Connector and Icon (1/8" miniphone) 1 23 122 Appendix A Connector Pin Assignments Pin Signal 1 +5 VDC 2 - - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 133
Line-out Audio Connector and Icon (1/8" miniphone) 1 23 External Infrared Transceiver Connector and Icon 4 Not used 5 Ground 6 Ground 7 Ground 8 Ground Pin Signal 9 +5V (fused) 10 Ground 11 Not used 12 DDC Serial Data 13 Horizontal Sync 14 Vertical Sync 15 DDC Serial Clock - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 134
ID 5 Ground 6 No Signal 7 Ground 8 Index 9 Ground 10 Reserved 11 Ground 12 Drive Select 33 Pin Signal 13 Ground 14 Disk Change 24-Pin Power Connector 24 12 Pin Signal 1 +3.3V 2 +3.3V 3 GND 4 +5V 5 GND 6 +5V 13 1 Pin Signal 7 GND 8 POK 9 +5 Vaux 10 +12V - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 135
10 Tach 11 GND 12 Fan-CMD Front Pin Signal 13 +12V 14 +5V Sense 15 GND 16 +5V 17 +5V 18 +3.3V Pin Signal 19 GND 20 +3.3V 21 Sense 22 +3.3V 23 +3.3V 24 GND -12V 4-Pin Power (for CPU) Connector and Icon Pin Signal 1 GND 2 GND 3 +12V CPU 4 -12V CPU 6-Pin Power (for CPU - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 136
Drive Connector Pin Signal S1 Ground S5 BP1 Ground P5 BP9 V 5 P13 V 12 *S = Data, P = Power Pin Signal S2 A+ S6 B+ P2 V 3.3 P6 Ground P10 Ground P14 V12 PCI Express x1, x4, x8, and x16 PCI Express Connector Pin Signal S3 AS7 Ground P3 V 3.3 P7 V 5 P11 Reserved P15 V 12 Pin Signal S4 Ground - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 137
, x4, x8, and x16 PCI Express Connector 67 GND 68 PERp12 69 PERn12 70 GND 72 PERp13 73 PERn13 74 GND 75 GND Pin B Pin Signal 1 +12V 2 +12V 3 RSVD 4 GND 5 SMCLK 26 GND 27 PETp3 28 PETn3 29 GND 30 RSVD Pin Signal 6 SMDAT 7 GND 8 +3.3 V 9 JTAG1 10 3.3vAux 31 PRSNT2# 32 GND - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 138
next page NOTE: x1 PCI Express uses pins 1-18 x4 PCI Express uses pins 1-32 x8 PCI Express uses pins 1-49 x16 PCI Express uses pins 1-8 10 T.M.D.S. Data1+ 11 T.M.D.S. Data1/3 Shield 12 T.M.D.S. Data3- 128 Appendix A Connector Pin Assignments Pin Signal 13 T.M.D.S. Data3+ 14 +5V Power - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 139
feature on the computer permits it to operate from any line voltage between 100-120 or 220-240 volts AC. Power supplies on those computers that do not have external power switches are equipped with internal switches that sense the incoming voltage and automatically switch to the proper voltage. The - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 140
Requirements Additional requirements specific to a country are shown in parentheses and explained below. Country Accrediting Agency Country Accrediting be a two-pole grounding type with a Japanese Industrial Standard C8303 (7A, 125V) configuration. 130 Appendix B Power Cord Set Requirements - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 141
source of the problem, and steps you can take to resolve the error condition. POST Message Disabled suppresses most system messages during POST, such as memory count and non-error text messages. If a POST error occurs, the screen will display the error message. To manually switch to the POST - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 142
to be replaced. Run Computer Setup and check the configuration in Advanced > Onboard Devices. Reset the date and time under Control Panel. If the problem persists, replace the RTC battery. See the Hardware Reference Guide for instructions on installing a new battery, or contact an authorized dealer - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 143
changes. 164-MemorySize Error Memory configuration incorrect. 1. Run Computer Setup or Windows utilities. 2. Make sure the memory module(s) are installed properly. 3. If third-party memory has been added, test using HP-only memory. 4. Verify proper memory module type. 201-Memory Error RAM - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 144
Setup and reset the IRQ in Advanced > Onboard Devices. 411-Network Interface Card Interrupt Conflict IRQ address conflicts with another device. Enter Computer Setup and reset the IRQ in Advanced > Onboard Devices. 501-Display Adapter Failure Graphics display controller. 1. Reseat the graphics - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 145
front audio harness. unseated from motherboard. 918-Front USB Not Connected Front USB harness has been detached or unseated from motherboard. Reconnect or replace front USB harness. 921-Device in PCI Express slot failed to initialize There is an incompatibility/problem with this device and - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 146
Storage Options > SATA Emulation back to RAID and select File > Save Changes and Exit. 1801-Microcode Patch Error Processor is not supported by ROM BIOS. 1. Upgrade BIOS to proper version. 2. Change the processor. 2200-PMM Allocation Error during MEBx Download Memory error during POST execution - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 147
1. Management Engine (ME) BIOS Extensions option ROM 2. Reboot the computer. Unplug the power cord, re-seat the memory modules, and reboot the computer. 3. If the memory configuration was recently changed, unplug the power cord, restore the original memory configuration, and reboot the computer - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 148
LED flashes every two seconds. None None Red Power LED flashes two 2 times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. Computer on. None Computer in Suspend to RAM mode (some models only) or normal Suspend mode - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 149
system will power up. Replace the power supply adapter with the HP-supplied USDT power supply adapter. Red Power LED flashes five 5 times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. Pre-video memory error. CAUTION - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 150
plug the power cord back in to the computer. 3. Replace the system board. 4. Replace the processor. Red Power LED flashes ten 10 times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. Bad option card. 1. Check each - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 151
the system board. 5. If the 5V_aux light on the system board is not turned on, remove the expansion cards one at a time until the 5V_aux light on the system board turns on. It the problem persists, replace the power supply. Interpreting POST Diagnostic Front Panel LEDs and Audible Codes 141 - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 152
, optical drive, graphics, audio, memory, and software problems. If you encounter problems with the computer, refer to the tables in this chapter for probable causes and recommended solutions. NOTE: For information on specific error messages that may appear on the screen during Power-On Self-Test - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 153
the drivers loaded. When booting the operating system, use "Last Known Configuration." ● Refer to the comprehensive online technical support at http://www.hp.com/support. ● Refer to the following Helpful Hints on page 143 section in this guide. To assist you in resolving problems online, HP Instant - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 154
board or other option. See Solving Hardware Installation Problems on page 163 for instructions. ● Be sure that all the needed device drivers have been installed. For example, if you are using a printer, you need a driver for that model printer. ● Remove all bootable media (diskette, CD, or USB - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 155
power button for more than four seconds. Otherwise, the computer will shut down and you will lose any unsaved data. Restart computer. Computer date and time display to update the RTC date and time). If the problem persists, replace the RTC battery. See the Hardware Reference Guide for instructions - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 156
memory. 2. Add more memory. Some applications run in the background and can be closed by right-clicking on their corresponding icons in the task tray. To prevent these applications from launching at startup, go to Start > Run (Windows XP) or Start > Accessories > Run 146 Appendix D Troubleshooting - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 157
Cause Solution (Windows Vista) and type msconfig. On the Startup tab of the System Configuration Utility, uncheck applications that you do not want to launch automatically. Some software applications, especially games, are stressful on the graphics subsystem 1. Lower the display resolution for - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 158
system board is off, then replace the power supply. 6. Replace the system board. Solving Power Problems Common causes and solutions for power problems are listed in the following table. Table D-2 Solving Power Problems Power supply shuts down intermittently. Cause Solution Voltage selector - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 159
Open the hood and ensure the 4- or 6-wire power supply cable is seated into the connector on the system board. 3. Check if a device is causing the problem by removing ALL attached devices (such as hard, diskette, or optical drives, and expansion cards). Power on the system. If the system enters the - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 160
Problems (continued) Drive not found. Cause Cable is loose. Removable drive is not seated properly. The device has been hidden in Computer Setup. Solution Reseat diskette drive data and power cable. Reseat the drive. Run the Computer Setup utility and ensure Device 1. From Windows Explorer select - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 161
problem with a file. In Microsoft Windows XP, right-click Start, click Explore, and select a drive. Select File > Properties > Tools. Under Errorchecking, click Check Now. In Microsoft Windows is displayed. power Network server mode is enabled in Computer Setup. Run Computer Setup and disable Network - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 162
. If it is listed, the probable cause is a driver problem. If it is not listed, the probable cause is a hardware problem. If this is a newly installed drive, run the Computer Setup utility and try adding a POST delay under Advanced > Power-On. The device is attached to a SATA port that has been - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 163
and change the "Emulation Type" to "Hard Disk" in the device's details under Storage > Device Configuration. Observe if the front panel Power LED is blinking RED and if any beeps are heard. See POST Error Messages on page 131 to determine possible causes for the blinking red and beep codes. See - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 164
down the computer and contact HP for a replacement been activated. enclosure. Solving Media Card Reader Problems Table D-5 Solving Media Card Reader Problems Media card will not work in a digital camera after formatting it in Microsoft Windows XP or Microsoft Windows Vista. Cause Solution By - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 165
slot, or is not supported. on the correct side. The green LED will light if inserted properly. Do not know how to remove a media card correctly. Cause The computer's software is used to safely eject the card. Solution Open My Computer (Windows XP) or Computer (Windows Vista), right-click on - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 166
the monitor cable into the graphics card connector on the back of the computer. Monitor settings in the computer are not compatible with the 1. In Windows XP Control Panel, double-click the Display monitor. icon and select the Settings tab. In Windows Vista Control Panel, under Appearance and - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 167
Display Problems (continued) Blank screen and the power LED flashes Red five times, once every second, followed by a two second pause, and the computer beeps five times. (Beeps stop after fifth iteration but LEDs continue flashing.) Cause Solution Pre-video memory error. 1. Reseat DIMMs. Power - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 168
drivers included in the upgrade kit. drivers may not be loaded. Monitor is not capable of displaying requested resolution. Change requested resolution. Graphics card is bad. Replace the graphics card for instructions. Image power is off while connecting the video cable. "Out of Range" displays - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 169
display menu. Manually synchronize the Clock and Clock Phase onscreen display functions. To download a SoftPaq that will assist you with the synchronization, go to the following Web site, select the appropriate monitor, and download either SP32347 or SP32202: http://www.hp.com/support Graphics card - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 170
media player applications. Solution Shut down all open processor-intensive applications. In Windows XP only: 1. From the Control Panel, select Sounds and Audio Devices. 2. On the Audio tab, select a device from the Sound Playback list. 3. Click the Advanced button and select the Performance tab - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 171
. Cause Solution Jack has been reconfigured in the audio driver or application In the audio driver or application software, reconfigure the jack software. or set the jack to its default value. Solving Printer Problems If you encounter printer problems, see the documentation that came with the - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 172
following table. Table D-9 Solving Keyboard Problems Keyboard commands and typing are not recognized by the computer. Cause Solution Keyboard connector is not properly connected. 1. On the Windows XP Desktop, click Start > Shut Down. On the Windows Vista Desktop, click Start, click the arrow on - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 173
10 Solving Mouse Problems Mouse does not respond to movement or is too slow. Cause Solution Mouse connector is not properly plugged into the back of the computer. Shut down the computer using the keyboard. 1. Press the Ctrl and Esc keys at the same time (or press the Windows logo key) to display - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 174
memory modules and to verify the proper installation. NOTE: DIMM 1 must always be installed. 2. Observe the beeps and LED lights on the front of the computer. Beeps and flashing LEDs are codes for specific problems. 3. If you still cannot resolve the issue, contact Customer Support. Power - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 175
Replace third-party memory with HP memory. 4. Replace the system board. Power LED flashes Red six times, once every second, followed by a two second pause, and the computer beeps six times. (Beeps stop after fifth iteration but LEDs continue flashing.) Cause Solution Graphics card is not seated - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 176
Problems Wake-on-LAN feature is not functioning. Cause Wake-on-LAN is not enabled. Solution To enable Wake-on-LAN in Windows XP: 1. Select Start > Control Panel. 2. Double-click Network Connections. 3. Double-click Local Area Connection. 4. Click Properties. 5. Click Configure. 6. Click the Power - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 177
service provider. Diagnostics passes, but the computer does not communicate with the network. Cause Solution Network drivers are not loaded, or driver parameters do not Make sure the network drivers are loaded and that the driver match current configuration. parameters match the configuration - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 178
attached to the correct device. Contact an authorized service provider. New network card will not boot. Cause Solution New network card may be defective or may not meet industry- Install a working, industry-standard NIC, or change the boot standard specifications. sequence to boot from - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 179
install, or remove a DIMM module. For those systems that support ECC memory, HP does not support mixing ECC and non-ECC memory. Otherwise, the computer will not boot the operating system. NOTE: The memory count will be affected by configurations with the Management Engine (ME) enabled. The ME uses - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 180
or is bad. 1. Reseat DIMMs. Power on the system. 2. Replace DIMMs one at a time to isolate the faulty module. 3. Replace third-party memory with HP memory. 4. Replace the system board. Solving Processor Problems If you encounter processor problems, common causes and solutions are listed in - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 181
. If it is listed, the probable cause is a driver problem. If it is not listed, the probable cause is a hardware problem. If this is a newly installed drive, run the Computer Setup utility and try adding a POST delay under Advanced > Power-On. The device is attached to a SATA port that has been - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 182
does not detect the CD-ROM or DVD-ROM drive. 1. Use Device Manager to remove or uninstall the device. 2. Restart the computer and let Windows detect the CD or DVD driver. Recording or copying CDs is difficult or impossible. Cause Wrong or poor quality media type. Solution 1. Try using a slower - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 183
: Supported USB Flash Media Device" section of the Service Reference Guide. The computer boots to DOS after making a bootable Drive Key. Cause Solution Drive Key is bootable. Install the Drive Key only after the operating system boots. Solving Front Panel Component Problems If you encounter - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 184
and restart the computer. The device does not have power. If the USB device requires AC power, be sure one end is connected to the device and one end is connected to a live outlet. The correct device driver is not installed. 1. Install the correct driver for the device. 2. You might need to - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 185
modem is connected and communicating properly. Windows XP 1. Select Start > Control Panel. 2. Double-click System. 3. Click the Hardware tab. 4. In the Device Manager area, click the Device Manager button. 5. Double-click Modems. 6. Double-click Agere Systems PCI-SV92PP Soft Modem. 7. On the General - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 186
Solving Software Problems Most software problems occur as a result of the following: ● The application was not installed or configured correctly. ● There is insufficient memory available to run the application. ● There is a conflict between applications. ● Be sure that all the needed device drivers - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 187
that the software is certified by Microsoft for your version of Windows. of Windows (see program packaging for this information). Configuration files are corrupt. If possible, save all data, close all programs, and restart the computer. Contacting Customer Support For help and service, contact - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 188
are used on most but not all HP system and riser boards. Designator BAT socket/Battery LED - 5V_Aux (on) Health-LED UID LED Power LED Hard drive activity LED Boot block header/jumper Boot block Quad stacked USB First IEEE 1394 connector Second IEEE 1394 connector SPDIF input SPDIF output PCI - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 189
VGA ports DVI connector Keyboard connector, PS/2 (Closest to power supply) Mouse connector, PS/2 Stacked mouse (Top)/keyboard (Bottom -stacked audio jack (line in, line out/headphone, microphone) Security board connector - for security card PCI slots on riser card PCI express slots on riser card 179 - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 190
Secondary Processor 12V header Main Power/HDD LED connector Speaker connector Analog audio connector (from CD-ROM) Primary chassis fan header or primary CPU heatsink fan Secondary chassis fan header Diskette drive connector Auxiliary Audio connector Alert on LAN connector VRM module footprint AUI - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 191
P87 P101 P106 P124 P125 P126 P150 P216 SW2 Blade PC graphics connector (outboard) Blade PC graphics connector (inboard) Second serial port Primary serial port Serial ATA (SATA) connector Primary (CPU) fan header for fansink Secondary CPU fan header for fansink Primary Serial Attached card 181 - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 192
64 bit Bridge LOM1 LOM1 EEPROM LOM1 PHY Audio Codec Audio amplifier LOM2 LOM2 EEPROM LOM2 PHY SPI ROM power switch First USB rear port power switch Second USB rear port power switch Third USB rear port power switch Battery retainer Memory slot. DIMM1 or RIMM1 populated and tested Following memory - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 193
Y1 Y2 Y3 Y4 Y5/H5 Primary (TH) system clock crystal Secondary (SMT) system clock crystal Primary NIC clock crystal Secondary NIC clock crystal RTC clock crystal/tie-down 183 - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 194
, Intel vPro-branded PCs with 27 adding devices 1 Altiris AClient 19 Deployment Solution Agent 19 asset tracking 36 audible codes 138 audio problems 159 B backup 26 Backup and Recovery Manager 2, 26 battery disposal 55 MT removal and replacement 81 SFF removal and replacement 115 beep codes 138 - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 195
Setup Utilities 30 configuring power button 35 connections MT system board 66 SFF system board 92 connector pin assignments 119 controlling access to computer 36 country power cord set requirements 130 cover lock 43 cover lock security, caution 43 Customer Support 142, 177 customizing software 19 - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 196
41 L LEDs blinking power 138 blinking PS/2 keyboard 138 line-in audio pin assignments 122 line-out audio pin assignments 123 locking Smart Cover Lock 43 M Media Card Reader problems 154 memory MT removal and replacement 61 problems 168 SFF removal and replacement 99 specifications 61, 99 microphone - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 197
152 hardware installation 163 Internet access 174 keyboard 162 Media Card Reader 154 memory 168 monitor 156 mouse 162 network 165 power 148 printer 161 processor 170 software 176 processor MT removal and replacement 79 problems 170 SFF removal and replacement 111 protecting hard drive 45 protecting - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 198
25 problems 176 recovery 19 Remote System Installation 20, 21 Restore Plus! CD 2 servicing computer 54 updating and management tools 21 spare part number tamper-resistent wrench 54 Torx T-15 screwdriver 54 speaker MT removal and replacement 75 SFF removal and replacement 108 specifications memory 61 - HP dx7400 | Service Reference Guide - HP Compaq dx7400 Business PC - Page 199
Software Manager download 22 white papers 27 U unlocking Smart Cover Lock 44 URLs (Web sites). See Web sites USB flash media device, bootable 32, 33 USB pin assignments 122 V ventilation, proper 52 W Wake-on-LAN feature 166 Web sites BIOS download 29 Fingerprint Identification Technology 44 HP
Service Reference Guide
HP Compaq dx7400 Business PC