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HP Dc7900 Service Reference Guide: HP Compaq dc7900 Business PC - Page 142

Installing DIMMs, the module.

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and the remainder is assigned to single channel. For optimal speed, the channels should be balanced so that the largest amount of memory is spread between the two channels. If one channel will have more memory than the other, the larger amount should be assigned to Channel A. For example, if you are populating the sockets with one 1-GB DIMM, and three 512-MB DIMMs, Channel A should be populated with the 1-GB DIMM and one 512-MB DIMM, and Channel B should be populated with the two 512-MB DIMMs. With this configuration, 2-GB will run as dual channel and 512-MB will run as single channel. ● In any mode, the maximum operational speed is determined by the slowest DIMM in the system. Installing DIMMs CAUTION: You must disconnect the power cord and wait approximately 30 seconds for the power to drain before adding or removing memory modules. Regardless of the power-on state, voltage is always supplied to the memory modules as long as the computer is plugged into an active AC outlet. Adding or removing memory modules while voltage is present may cause irreparable damage to the memory modules or system board. If you see an LED light on the system board, voltage is still present. The memory module sockets have gold-plated metal contacts. When upgrading the memory, it is important to use memory modules with gold-plated metal contacts to prevent corrosion and/or oxidation resulting from having incompatible metals in contact with each other. Static electricity can damage the electronic components of the computer or optional cards. Before beginning these procedures, ensure that you are discharged of static electricity by briefly touching a grounded metal object. When handling a memory module, be careful not to touch any of the contacts. Doing so may damage the module. 1. Prepare the computer for disassembly (Preparation for Disassembly on page 118). 2. Remove the access panel (Computer Access Panel on page 125). 3. Rotate up the external drive bay housing and the power supply to access the memory module sockets on the system board. WARNING! To reduce risk of personal injury from hot surfaces, allow the internal system components to cool before touching. 130 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis

Section	Page
Installing and Customizing the Software	13
Installing the Operating System	13
Installing or Upgrading Device Drivers	13
HP Backup and Recovery Manager	14
Computer Setup (F10) Utility	15
Computer Setup (F10) Utilities	15
Using Computer Setup (F10) Utilities	16
Computer Setup—File	17
Computer Setup—Storage	18
Computer Setup—Security	20
Computer Setup—Power	24
Computer Setup—Advanced	25
Recovering the Configuration Settings	28
Computer Diagnostic Features	29
HP Insight Diagnostics	29
Accessing HP Insight Diagnostics	29
Survey Tab	30
Test Tab	31
Status Tab	31
Log Tab	32
Help Tab	32
Saving and Printing Information in HP Insight Diagnostics	33
Downloading the Latest Version of HP Insight Diagnostics	33
Protecting the Software	33
HP Backup and Recovery Manager	34
Desktop Management	35
Initial Configuration and Deployment	35
HP Software Agent	36
Altiris Deployment Solution Agent	36
Remote System Installation	36
Software Updating and Management	37
HP Client Management Interface	37
HP SoftPaq Download Manager	38
HP System Software Manager	38
HP ProtectTools Security Manager	39
HP Client Automation Starter and Standard Editions	39
HP Client Automation Enterprise Edition	40
HP Client Manager from Symantec	40
Altiris Client Management Suite	41
HP Client Catalog for Microsoft System Center & SMS Products	41
HP Backup and Recovery Manager	41
Management Technology	42
Verdiem Surveyor	44
HP Proactive Change Notification	44
Subscriber’s Choice	44
Retired Solutions	44
ROM Flash	45
Remote ROM Flash	45
HPQFlash	45
Boot Block Emergency Recovery Mode	45
Replicating the Setup	46
Copying to Single Computer	46
Copying to Multiple Computers	47
Creating a Bootable Device	48
Supported USB Flash Media Device	48
Unsupported USB Flash Media Device	49
Dual-State Power Button	50
HP Web Site Support	51
Industry Standards	51
Asset Tracking and Security	51
Password Security	55
Establishing a Setup Password Using Computer Setup	55
Establishing a Power-On Password Using Computer Setup	55
Entering a Power-On Password	56
Entering a Setup Password	56
Changing a Power-On or Setup Password	56
Deleting a Power-On or Setup Password	57
National Keyboard Delimiter Characters	57
Clearing Passwords	58
DriveLock	58
Using DriveLock	58
DriveLock Applications	59
Smart Cover Sensor	59
Setting the Smart Cover Sensor Protection Level	59
Smart Cover Lock	60
Locking the Smart Cover Lock	60
Unlocking the Smart Cover Lock	60
Using the Smart Cover FailSafe Key	60
Cable Lock Provision	61
Fingerprint Identification Technology	61
Fault Notification and Recovery	61
Drive Protection System	61
Surge-Tolerant Power Supply	61
Thermal Sensor	62
Serial and Parallel ATA Drive Guidelines and Features	63
SATA Hard Drives	63
SATA Hard Drive Cables	64
SATA Data Cable	64
SATA Power Cable	64
PATA Device Information	65
ATA SMART Drives	65
Hard Drive Capacities	65
Identifying the Chassis, Routine Care, and Disassembly Preparation	66
Chassis Designations	66
Convertible Minitower (CMT)	66
Small Form Factor (SFF)	67
Ultra-Slim Desktop (USDT)	67
Electrostatic Discharge Information	68
Generating Static	68
Preventing Electrostatic Damage to Equipment	68
Personal Grounding Methods and Equipment	69
Grounding the Work Area	69
Recommended Materials and Equipment	69
Operating Guidelines	70
Routine Care	71
General Cleaning Safety Precautions	71
Cleaning the Computer Case	71
Cleaning the Keyboard	71
Cleaning the Monitor	72
Cleaning the Mouse	72
Service Considerations	72
Power Supply Fan	72
Tools and Software Requirements	72
Screws	73
Cables and Connectors	73
Hard Drives	73
Lithium Coin Cell Battery	74
Removal and Replacement Procedures Convertible Minitower (CMT) Chassis	75
Preparation for Disassembly	75
Unlocking the Smart Cover Lock	76
Smart Cover FailSafe Key	76
Using the Smart Cover FailSafe Key to Remove the Smart Cover Lock	76
External Security Devices	78
Installing a Security Lock	78
Cable Lock	78
Padlock	79
HP Business PC Security Lock	80
Computer Access Panel	82
Front Bezel	83
Bezel Blanks	84
Cable Management	85
Cable Connections	86
Installing Additional Memory	87
DIMMs	87
DDR2-SDRAM DIMMs	87
Populating DIMM Sockets	88
Installing DIMMs	89
Expansion Cards	91
Drives	95
System Board Drive Connections	97
Drive Positions	98
Removing a Drive from a Drive Bay	99
Installing a 5.25-inch or 3.5-inch Drive into an External Drive Bay	103
Installing a 3.5-inch SATA Hard Drive into an Internal Drive Bay	105
Removing and Replacing a Removable 3.5-inch SATA Hard Drive	107
Front I/O, USB, Power Switch Assembly	112
Speaker	113
Rear Chassis Fan	114
eSATA port assembly	115
Heatsink	116
Fan Shroud	117
Processor	118
Front Chassis Fan	119
Power Supply	120
System Board	121
Battery	122
Type 1 Battery Holder	123
Type 2 Battery Holder	123
Type 3 Battery Holder	124
Changing from a Minitower to a Desktop Configuration	125
Changing from a Desktop to a Minitower Configuration	127
Removal and Replacement Procedures Small Form Factor (SFF) Chassis	130
Preparation for Disassembly	130
Unlocking the Smart Cover Lock	131
Smart Cover FailSafe Key	131
Using the Smart Cover FailSafe Key to Remove the Smart Cover Lock	131
External Security Devices	133
Installing a Security Lock	133
Cable Lock	133
Padlock	134
HP Business PC Security Lock	135
Front Bezel Security	137
Computer Access Panel	137
Front Bezel	138
Bezel Blanks	139
Installing Additional Memory	140
DIMMs	140
DDR2-SDRAM DIMMs	140
Populating DIMM Sockets	141
Installing DIMMs	142
Expansion Cards	144
Cable Management	149
Cable Connections	150
Drives	151
Drive Positions	151
Installing and Removing Drives	152
System Board Drive Connections	154
Removing an Optical Drive	155
Installing an Optical Drive into the 5.25-inch Drive Bay	156
Removing an External 3.5-inch Drive	159
Installing a Drive into the 3.5-inch External Drive Bay	162
Removing and Replacing the Primary 3.5-inch Internal SATA Hard Drive	164
Removing and Replacing a Removable 3.5-inch SATA Hard Drive	168
Fan Shroud	173
Front Fan Assembly	174
Hood Sensor	175
Power Switch Assembly	176
Front I/O Device	177
Speaker	177
Smart Cover Lock	178
Heatsink	179
Processor	180
Power Supply	181
System Board	183
Backwall	184
Battery	185
Type 1 Battery Holder	186
Type 2 Battery Holder	186
Type 3 Battery Holder	187
Using the Small Form Factor Computer in a Tower Orientation	188
Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis	190
Preparation for Disassembly	190
External Security Devices	191
Installing a Security Lock	191
Cable Lock	191
Padlock	192
HP Business PC Security Lock	192
Computer Access Panel	195
Front Bezel	196
Bezel Blank	197
Installing Additional Memory	198
SODIMMs	198
DDR2-SDRAM SODIMMs	198
Populating SODIMM Sockets	199
Installing SODIMMs	200
Cable Management	202
Cable Connections	203
Replacing the Optical Drive	203
Removing the Existing Optical Drive	203
Preparing the New Optical Drive	204
Installing the New Optical Drive	205
Optical Drive Connector	205
Hard Drive	207
Hard Drive Cage	211
Port Cover	212
Front Fan	213
Speaker	214
Rear Fan	215
Heatsink	216
Processor	217
System Board	218
Hood Sensor	220
Battery	220
Changing from Desktop to Tower Configuration	222
Connector Pin Assignments	224
Keyboard	224
Mouse	224
Ethernet BNC	224
Ethernet RJ-45	225
Ethernet AUI	225
Parallel Interface	226
Serial Interface, Powered and Non-Powered	226
USB	227
Microphone	227
Headphone	227
Line-in Audio	227
Line-out Audio	227
External Infrared Transceiver	228
Monitor	228
ATA/ATAPI (IDE) Standard Drive Cable	229
CD-ROM 50-Pin Connector	230
24-Pin Power	230
24-Pin MicroFit Power (CMT, SFF)	231
4-Pin Power (for CPU)	231
6-Pin Power (for CPU) (CMT, SFF)	231
SATA Data and Power	232
PCI Express	232
PCI Express	233
PCI Express Mini Card	234
DVI Connector	235
Power Cord Set Requirements	236
General Requirements	236
Japanese Power Cord Requirements	236
Country-Specific Requirements	237
POST Error Messages	238
POST Numeric Codes and Text Messages	239
Interpreting POST Diagnostic Front Panel LEDs and Audible Codes	245
Troubleshooting Without Diagnostics	249
Safety and Comfort	249
Before You Call for Technical Support	249
Helpful Hints	250
Solving General Problems	252
Solving Power Problems	255
Solving Diskette Problems	256
Solving Hard Drive Problems	259
Solving Media Card Reader Problems	261
Solving Display Problems	263
Solving Audio Problems	267
Solving Printer Problems	268
Solving Keyboard and Mouse Problems	270
Solving Hardware Installation Problems	271
Solving Network Problems	273
Solving Memory Problems	276
Solving Processor Problems	277
Solving CD-ROM and DVD Problems	278
Solving USB Flash Drive Problems	280
Solving Front Panel Component Problems	281
Solving Internet Access Problems	281
Solving Software Problems	283
Contacting Customer Support	284
System Board and Riser Board Reference Designators	285
Specifications	291
CMT Specifications	291
SFF Specifications	292
USDT Specifications	293

Match case Limit results 1 per page

and the remainder is assigned to single channel. For optimal speed, the channels should be

balanced so that the largest amount of memory is spread between the two channels. If one channel

will have more memory than the other, the larger amount should be assigned to Channel A. For

example, if you are populating the sockets with one 1-GB DIMM, and three 512-MB DIMMs,

Channel A should be populated with the 1-GB DIMM and one 512-MB DIMM, and Channel B should

be populated with the two 512-MB DIMMs. With this configuration, 2-GB will run as dual channel

and 512-MB will run as single channel.

●

In any mode, the maximum operational speed is determined by the slowest DIMM in the system.

Installing DIMMs

CAUTION:

You must disconnect the power cord and wait approximately 30 seconds for the power to

drain before adding or removing memory modules. Regardless of the power-on state, voltage is always

supplied to the memory modules as long as the computer is plugged into an active AC outlet. Adding

or removing memory modules while voltage is present may cause irreparable damage to the memory

modules or system board. If you see an LED light on the system board, voltage is still present.

The memory module sockets have gold-plated metal contacts. When upgrading the memory, it is

important to use memory modules with gold-plated metal contacts to prevent corrosion and/or oxidation

resulting from having incompatible metals in contact with each other.

Static electricity can damage the electronic components of the computer or optional cards. Before

beginning these procedures, ensure that you are discharged of static electricity by briefly touching a

grounded metal object.

When handling a memory module, be careful not to touch any of the contacts. Doing so may damage

the module.

Prepare the computer for disassembly (

Preparation for Disassembly

on page

118

Remove the access panel (

Computer Access Panel

on page

125

Rotate up the external drive bay housing and the power supply to access the memory module

sockets on the system board.

WARNING!

To reduce risk of personal injury from hot surfaces, allow the internal system

components to cool before touching.

130

Chapter 8

Removal and Replacement Procedures Small Form Factor (SFF) Chassis