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HP ProDesk 400 G1 Micro Maintenance and Service Guide ProDesk 400 G1 Microtowe - Page 88

Power switch/LED assembly, Press down on the top of the assembly to disengage the tab

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Power switch/LED assembly Description Power switch/LED assembly Spare part number 745050-001 1. Prepare the computer for disassembly (Preparation for disassembly on page 42). 2. Remove the access panel (Access panel on page 43). 3. Remove the front bezel (Front bezel on page 44). 4. Disconnect the cable from the system board connector labeled PB/LED. NOTE: System board appearance may vary. 5. Press down on the top of the assembly to disengage the tab (1) that secures the assembly to the chassis. 78 Chapter 5 Removal and replacement procedures: Microtower

Section	Page
Product features	11
Standard configuration features	11
Microtower	11
Small Form Factor	12
Front panel components	13
Microtower (model 400/490)	13
Small form factor	14
Rear panel components	15
Microtower (model 400)	15
Microtower (model 490)	16
Small form factor	17
Serial number location	18
Microtower	18
Small Form Factor	18
Activating and Customizing the Software	19
Activating and customizing the software in Windows 7	19
Activating the Windows operating system	19
Downloading Windows 7 updates	20
Installing or upgrading device drivers	20
Customizing the monitor display	20
Activating and customizing the software in Windows 8	20
Activating the Windows Operating System	20
Downloading Windows 8 updates	21
Customizing the monitor display	21
Illustrated parts catalog	22
Microtower chassis spare parts	23
Computer major components	23
Cables	26
Misc parts	27
Drives	29
Misc boards	29
Sequential part number listing	30
Small Form Factor chassis spare parts	34
Computer major components	34
Cables	36
Misc parts	37
Drives	38
Misc boards	39
Sequential part number listing	39
Routine care, SATA drive guidelines, and disassembly preparation	43
Electrostatic discharge information	43
Generating static	44
Preventing electrostatic damage to equipment	44
Personal grounding methods and equipment	45
Grounding the work area	45
Recommended materials and equipment	45
Operating guidelines	46
Routine care	47
General cleaning safety precautions	47
Cleaning the Computer Case	47
Cleaning the keyboard	47
Cleaning the monitor	48
Cleaning the mouse	48
Service considerations	48
Power supply fan	48
Tools and software Requirements	49
Screws	49
Cables and connectors	49
Hard Drives	49
Lithium coin cell battery	50
SATA hard drives	50
SATA hard drive cables	51
SATA data cable	51
SMART ATA drives	51
Cable management	51
Removal and replacement procedures: Microtower	52
Preparation for disassembly	52
Access panel	53
Front bezel	54
Bezel blanks	55
Memory	57
DIMMs	57
DDR3-SDRAM DIMMs	57
Populating DIMM sockets (Model 400)	58
Populating DIMM sockets (Model 490)	58
Installing DIMMs	59
Expansion cards	61
System board connections – model 400	66
System board connections – model 480	67
System board connections – model 490	68
Drives	69
Drive positions	72
Removing a 5.25-inch drive	73
Installing a 5.25-inch drive	73
Removing a 3.5-inch device	75
Installing a 3.5-inch device (model 400)	77
Installing a 3.5-inch device (model 480 and model 490)	79
Removing a 3.5-inch hard drive	80
Installing a 3.5-inch drive	81
DisplayPort connector module (480 MT and 490 MT models only)	84
Front I/O assembly	86
Power switch/LED assembly	88
Fan sink	90
Processor	92
Speaker	94
Fan	96
Power supply	97
System board	100
Removal and replacement procedures: Small Form Factor	102
Preparation for disassembly	102
Access panel	103
Front bezel	104
Front bezel security	105
Bezel blanks	106
Memory	107
DIMMs	107
DDR3-SDRAM DIMMs	107
Populating DIMM sockets	108
Installing DIMMs	108
Expansion card	110
System board connections	114
Drives	115
Drive positions	117
Removing a 3.5-inch device	118
Installing a 3.5-inch device	119
Removing a slim optical drive	122
Installing a slim optical drive	123
Removing and replacing a 3.5-inch hard drive	124
Removing a 2.5-inch hard drive	127
Installing a 2.5-inch hard drive	127
Power supply	129
Fan duct	131
Front I/O assembly	132
Power switch assembly	135
Speaker	138
Fan sink	140
Processor	142
System board	144
Changing from desktop to tower configuration	146
Computer Setup (F10) Utility	147
Computer Setup (F10) Utilities	147
Using Computer Setup (F10) Utilities	148
Computer Setup—File	149
Computer Setup—Storage	150
Computer Setup—Security	152
Computer Setup—Power	157
Computer Setup—Advanced	158
Recovering the Configuration Settings	160
Troubleshooting without diagnostics	161
Safety and comfort	161
Before you call for technical support	161
Helpful hints	162
Solving general problems	164
Solving power problems	168
Solving hard drive problems	169
Solving media card reader problems	172
Solving display problems	174
Solving audio problems	179
Solving printer problems	181
Solving keyboard and mouse problems	182
Solving Hardware Installation Problems	184
Solving Network Problems	187
Solving memory problems	190
Solving processor problems	192
Solving CD-ROM and DVD problems	193
Solving USB flash drive problems	195
Solving front panel component problems	196
Solving Internet access problems	196
Solving software problems	198
POST error messages	200
POST numeric codes and text messages	201
Interpreting POST diagnostic front panel LEDs and audible codes	209
Password security and resetting CMOS	213
Resetting the password jumper	214
Clearing and resetting the CMOS	215
HP PC Hardware Diagnostics	217
Why run HP PC Hardware Diagnostics	217
How to access and run HP PC Hardware Diagnostics	217
Downloading HP PC Hardware Diagnostics to a USB device	218
System backup and recovery	219
Backing up, restoring, and recovering in Windows 8.1 or Windows 8	219
Creating recovery media and backups	219
Restoring and recovering using Windows tools	220
Using Reset when the system is not responding	220
Recovery using the Windows recovery USB flash drive	221
Recovery using Windows operating system media (purchased separately)	221
Backing up, restoring, and recovering in Windows 7	222
Creating recovery media	222
Creating recovery media using HP Recovery Manager (select models only)	223
Creating recovery discs with HP Recovery Disc Creator (select models only)	224
Creating recovery discs	224
Backing up your information	225
System Restore	225
System Recovery	226
System Recovery when Windows is responding	226
System Recovery when Windows is not responding	227
System Recovery using recovery media (select models only)	227
Using HP Recovery Disc operating system discs (select models only)	228
Battery replacement	230
Power cord set requirements	233
General requirements	233
Japanese power cord requirements	233
Country-specific requirements	234
Specifications	235
Microtower specifications	235
SFF specifications	236