HP Dx5150 - Compaq Business Desktop Troubleshooting Manual page 28

Troubleshooting Without Diagnostics
Solving Power Supply Problems (Continued)
Problem
Power LED flashes Red four
times, once every second,
followed by a two-second
pause. The Power LED will
continue flashing until the
problem is resolved.
2–12
Cause
Power failure (power
supply is overloaded).
www.hp.com
Solution
1. Check that the voltage selector,
located on the rear of the power
supply (some models), is set to
the appropriate voltage. Proper
voltage setting depends on your
region.
2. Open the hood and ensure the
4-wire power supply cable is
seated into the connector on the
system board.
3. 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.
4. Contact an authorized service
provider to replace the power
supply.
5. Replace the system board.
Troubleshooting Guide