Service Reference Guide, dc5750 437963-001 C–9
POST Error Messages
Red Power LED
flashes three times,
once every
second, followed
by a two second
pause. Beeps stop
after fifth iteration
but LEDs continue
until problem is
solved.
3 Processor not
installed (not an
indicator of bad
processor).
1. Check to see that the processor is
present.
2. Reseat the processor.
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).
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.
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.
5Pre-video memory
error.
Ä
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. R e s e a t D I M M s .
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.
POST Diagnostic Front Panel LEDs and Audible Codes (Continued)
Activity Beeps Possible Cause Recommended Action
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