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Table B-2 Diagnostic Front Panel LEDs and Audible Codes (continued)
Activity Blinks Possible Cause Recommended Action
Red Power LED flashes
four times, once every
second, followed by a two
second pause. Beeps stop
after fifth iteration but
LEDs continue until
problem is solved.
4 Power failure (power supply
is overloaded).
OR
The incorrect external power
supply adapter is being used
on the USDT.
1. Open the hood and ensure the 4 or 6-wire power
supply cable is seated into the connector on the
system board.
2. 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
POST, then power off and replace one device at
a time and repeat this procedure until failure
occurs. Replace the device that is causing the
failure. Continue adding devices one at a time to
ensure all devices are functioning properly.
3. Replace the power supply.
4. Replace the system board.
OR
The USDT power supply adapter must be at 135W
and use the Smart ID technology before the system
will power up. Replace the power supply adapter with
the HP-supplied USDT power supply adapter.
Red Power LED flashes
five times, once every
second, followed by a two
second pause. Beeps stop
after fifth iteration but
LEDs continue until
problem is solved.
5 Pre-video memory error. CAUTION: To avoid damage to the DIMMs or the
system board, you must unplug the computer power
cord before attempting to reseat, install, or remove a
DIMM module.
1. Reseat DIMMs.
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
six times, once every
second, followed by a two
second pause. Beeps stop
after fifth iteration but
LEDs continue until
problem is solved.
6 Pre-video graphics error. For systems with a graphics card:
1. Reseat the graphics card.
2. Replace the graphics card.
3. Replace the system board.
For systems with integrated graphics, replace the
system board.
Red Power LED flashes
eight times, once every
second, followed by a two
second pause. Beeps stop
after fifth iteration but
LEDs continue until
problem is solved.
8 Invalid ROM based on bad
checksum.
1. Reflash the system ROM with the latest BIOS
image.
2. Replace the system board.
Interpreting POST Diagnostic Front Panel LEDs and Audible Codes 95
- Maintenance and Service Guide 1
- About This Book 3
- Table of contents 5
- 1 Product Features 9
- Front Panel Components 10
- Rear Panel Components 11
- Serial Number Location 12
- Software 13
- Computer Setup—File 18
- Computer Setup—Storage 19
- Computer Setup—Security 20
- Computer Setup—Power 22
- Computer Setup—Advanced 23
- SATA Hard Drives 25
- SATA Hard Drive Cables 25
- SMART ATA Drives 26
- Hard Drive Capacities 26
- Chassis Designations 27
- Generating Static 28
- Grounding the Work Area 29
- Operating Guidelines 30
- Routine Care 31
- Service Considerations 32
- Cables and Connectors 33
- Hard Drives 33
- Lithium Coin Cell Battery 34
- 6 Illustrated parts catalog 35
- Spare parts 29 37
- Spare parts 31 39
- Spare parts 33 41
- Spare parts 35 43
- Preparation for Disassembly 45
- Computer Access Panel 47
- Front Bezel 48
- Bezel Blanks 49
- System Board Connections 50
- Installing Additional Memory 51
- Populating DIMM Sockets 52
- Installing DIMMs 52
- Cable Management 61
- Drive Positions 63
- Description Spare part number 77
- Baffle 636921-001 77
- Front Fan Assembly 78
- Speaker 636925-001 80
- Heat sink 81
- Processor 84
- Power Supply 86
- P2 PWRCMD 87
- P3 PWRCPU 87
- System Board 88
- Type 1 Battery Holder 91
- Type 2 Battery Holder 91
- Type 3 Battery Holder 92
- Orientation 93
- Installing a Security Lock 94
- Installing a Security Lock 87 95
- Front Bezel Security 96
- A Power Cord Set Requirements 98
- Country-Specific Requirements 99
- B POST Error Messages 100
- Audible Codes 102
- Safety and Comfort 104
- Helpful Hints 105
- Solving General Problems 107
- Solving General Problems 101 109
- Solving Power Problems 111
- Solving Hard Drive Problems 113
- Solving Display Problems 118
- Solving Display Problems 111 119
- Solving Display Problems 113 121
- Solving Audio Problems 123
- Solving Printer Problems 125
- Solving Network Problems 131
- Solving Network Problems 125 133
- Solving Memory Problems 134
- Solving Memory Problems 127 135
- Solving Processor Problems 136
- Cause Solution 142
- Solving Software Problems 144
- Resetting the Password Jumper 146
- F System Recovery 151
- System Recovery options 152
- Recovery media 154
- G Specifications 156
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