HP ProDesk 400 G7 SFF Maintenance And Service Manual page 104

Table 7-2 Interpreting POST diagnostic front panel lights and audible codes (continued)
Activity
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.
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.
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.
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.
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.
96 Chapter 7 POST error messages
Beeps Possible cause
4 Power failure (power supply
is overloaded).
5 Pre-video memory error.
6 Pre-video graphics error.
7 System board failure (ROM
detected failure prior to
video).
8 Invalid ROM based on bad
checksum.
Recommended action
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.
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.
Replace the system board.
Replace the system board.
1. Reflash the system ROM with the latest BIOS
image.
2. Replace the system board.
ENWW