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D–22 483941-001 Service Reference Guide
Troubleshooting Without Diagnostics
Diagnostic Front Panel LEDs and Audible Codes
Diagnostic Front Panel LEDs and Audible Codes
Activity Beeps Possible Cause Recommended Action
Green Power LED
On.
None Computer on. None
Green Power LED
flashes every two
seconds.
None Computer in
Suspend to RAM
mode (some
models only) or
normal Suspend
mode.
Not support wake up by mouse/
keyboard.
Should be Press Power button.
CPU Fan weak
(RPM < 600) or not
turning, Display
Warning message
and Long Beep for
5 sec and shut
down.
System Fan weak
(RPM < 600) or not
turning, Display
Warning message
and Long Beep for
5 sec and shut
down.
2 Processor thermal
protection
activated:
A fan may be
blocked or not
turning.
OR
The heatsink/fan
assembly is not
properly attached
to the processor.
1. Ensure that the computer air vents
are not blocked and the processor
cooling fan is running.
2. Open hood, press power button,
and see if the processor fan spins.
If the processor fan is not
spinning, make sure the fan's
cable is plugged onto the system
board header. Ensure the fan is
fully/properly seated or installed.
3. If fan is plugged in and seated
properly, but is not spinning, then
replace processor fan.
4. Reseat processor heatsink and
verify that the fan assembly is
properly attached.
5. Contact an authorized reseller or
service provider.
Red Power LED
flashes five times,
one every second,
followed by a 2
second pause. Also
5 simultaneous
beeps will be
heard.
5 Pre-video memory
error.
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.
Red Power LED
flashes 6 times, one
every second,
followed by a 2
second pause. Also
6 simultaneous
beeps will be
heard.
6 Pre-video graphics
error.
For systems with a graphics card:
1. Reseat the graphics card. Power
on the system.
2. Replace the graphics card.
3. Replace the system board.
For systems with integrated graphics,
replace the system board.
- Business PCs 1
- 1st Edition 1
- Service Reference Guide 2
- First Edition (February 2008) 3
- Contents 4
- A Connector Pin Assignments 6
- B Power Cord Set Requirements 6
- C POST Error Messages 6
- E Memory 6
- Redflag Linux 7
- 1.3 HP Software 8
- 2.1 Power-On Self-Test (POST) 9
- 2.2 Computer Setup Utilities 10
- 2.2.2 Computer Setup Menu 12
- Computer Setup (Continued) 13
- 2.3.1 Backing up the CMOS 19
- 2.3.2 Restoring the CMOS 19
- Desktop Management 20
- 3.2.2 Dual-State Power Button 21
- 3.2.3 Power Management 21
- 3.3 Security 22
- Entering a User Password 23
- Clearing Passwords 25
- 4.1 SATA 3.0 Hard Drives 26
- 4.2 SATA Hard Drive Cables 27
- 4.3 SATA SMART Drives 28
- 4.4 Drive Capacities 28
- 4.5 SATA BIOS 28
- Disassembly Preparation 29
- 5.2.1 Generating Static 31
- 5.2.4 Grounding the Work Area 32
- 5.3 Routine Care 33
- 5.3.3 Cleaning the Keyboard 34
- 5.3.4 Cleaning the Monitor 34
- 5.3.5 Cleaning the Mouse 34
- 5.4 Service Considerations 35
- 5.4.3 Cables and Connectors 36
- 5.4.4 Hard Drives 36
- MT chassis and SFF chassis) 38
- (SFF chassis) 40
- Removing the Front Bezel 41
- Minitower Configuration 42
- 6.4 Front Drive Bezels 43
- 6.5 Memory 44
- Installing a DIMM 46
- 6.6 Expansion Cards 47
- Installing an Expansion Card 50
- 6.7 Cable Management 52
- 6.8 Drives 53
- 6.8.2 Removing a Drive 54
- Removing the Hard disk 55
- Releasing the Hard Drive Cage 55
- Removing the Hard Drive Cage 56
- Removing the Hard Drive 57
- Desktop Drive Positions 57
- Installing the Optical Drive 60
- 6. Press the latch 1 63
- 6.10 System Fan 65
- 6.11 Heatsink - MT chassis 66
- 6.12 Processor 67
- 6.13 System Board 69
- 6.14 Battery 70
- 6.14.1 Battery Holder 71
- 6.15 Power Supply 72
- Connector Pin Assignments 73
- Parallel Interface 74
- Microphone 74
- Headphone 75
- Line-In Audio 75
- Line-Out Audio 75
- 24-Pin Power 76
- 4-Pin Power (for CPU) 76
- Power Cord Set Requirements 77
- POST Error Messages 78
- Preliminary Checklist 81
- Solving General Problems 82
- Solving Display Problems 87
- Solving Audio Problems 90
- Solving Printer Problems 92
- Solving Keyboard Problems 93
- Solving Network Problems 94
- Solving Memory Problems 96
- Solving Processor Problems 97
- Solving Drive Key Problems 99
- Restoring the Software 105
- Contacting Customer Support 106
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