HP Compaq Pro 4300 Maintenance And Service Manual page 114

Table B-2
Activity
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.
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.
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.
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.
106 Appendix B POST Error Messages
Diagnostic Front Panel LEDs and Audible Codes (continued)
Blinks Possible Cause
4 Power failure (power supply
is overloaded).
OR
The incorrect external power
supply adapter is being used
on the USDT.
5 Pre-video memory error.
6 Pre-video graphics error.
8 Invalid ROM based on bad
checksum.
Recommended Action
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.
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.
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.
1. Reflash the system ROM with the latest BIOS
image.
2. Replace the system board.