HP Dx5150 - Compaq Business Desktop Troubleshooting Manual page 71

Diagnostic Front Panel LEDs and Audible Codes (Continued)
Activity
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.
Red Power LED
flashes five times,
once every second,
followed by a
two-second pause.
The Power LED will
continue flashing
until the problem is
resolved.
Troubleshooting Guide
Possible
Beeps Cause
None Power failure
(power supply
is
overloaded).
5 Pre-video
memory error.
www.hp.com
Recommended Action
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.
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.
POST Error Messages
A–7