HP ProDesk 480 G7 PCI Micro Maintenance and Service Guide - Page 108

Interpreting POST diagnostic front panel lights and audible codes continued, Table 7-2

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Table 7-2 Interpreting POST diagnostic front panel lights and audible codes (continued) Activity Beeps Possible cause Recommended action Red power light blinks four times, 4 once every second, followed by a two-second pause. Beeps stop after fifth iteration, but lights continue until problem is solved. Power failure (power supply 1. Check if a device is causing the problem by is overloaded). removing all attached devices. 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. 2. Replace the power supply. 3. Replace the system board. Red power light blinks five times, 5 once every second, followed by a two-second pause. Beeps stop after fifth iteration, but lights continue until problem is solved. Pre-video memory error. IMPORTANT: 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 light blinks six times, 6 once every second, followed by a two-second pause. Beeps stop after fifth iteration, but lights continue until problem is solved. Pre-video graphics error. Replace the system board. Red power light blinks seven 7 times, once every second, followed by a two-second pause. Beeps stop after fifth iteration, but lights continue until problem is solved. System board failure (ROM detected failure prior to video). Replace the system board. Red power light blinks eight 8 times, once every second, followed by a two-second pause. Beeps stop after fifth iteration, but lights continue until problem is solved. Invalid ROM based on bad checksum. 1. Reflash the system ROM with the latest BIOS image. 2. Replace the system board. 100 Chapter 7 POST error messages ENWW

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Table 7-2
Interpreting POST diagnostic front panel lights and audible codes (continued)
Activity
Beeps
Possible cause
Recommended action
Red power light blinks four times,
once every second, followed by a
two-second pause. Beeps stop
after fifth iteration, but lights
continue until problem is solved.
4
Power failure (power supply
is overloaded).
1.
Check if a device is causing the problem by
removing all attached devices. 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.
2.
Replace the power supply.
3.
Replace the system board.
Red power light blinks five times,
once every second, followed by a
two-second pause. Beeps stop
after fifth iteration, but lights
continue until problem is solved.
5
Pre-video memory error.
IMPORTANT:
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 light blinks six times,
once every second, followed by a
two-second pause. Beeps stop
after fifth iteration, but lights
continue until problem is solved.
6
Pre-video graphics error.
Replace the system board.
Red power light blinks seven
times, once every second,
followed by a two-second pause.
Beeps stop after fifth iteration,
but lights continue until problem
is solved.
7
System board failure (ROM
detected failure prior to
video).
Replace the system board.
Red power light blinks eight
times, once every second,
followed by a two-second pause.
Beeps stop after fifth iteration,
but lights 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.
100
Chapter 7
POST error messages
ENWW