Service Reference Guide, dx5150
361685-001
C–5
POST Error Messages
Red Power LED
flashes three times,
once every second,
followed by a
two-second pause.
The Power LED will
continue flashing
until the problem is
resolved.
None
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.
The Power LED will
continue flashing
until the problem is
resolved.
None
Power failure
(power supply
overloaded).
1. Open the hood and ensure the
4-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,
and the computer
beeps five times.
Beeps stop after
five times but the
Power LED will
continue flashing
until the problem is
resolved.
5
Pre-video
memory error.
1. Reseat DIMMs. Power on the
system.
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.
Diagnostic Front Panel LEDs and Audible Codes
(Continued)
Activity
Beeps
Possible
Cause
Recommended Action
