Troubleshooting Without Diagnostics

 

 

 

 

 

 

Solving Power Supply Problems (Continued)

 

 

 

 

 

Problem

Cause

Solution

 

 

 

 

Power LED flashes Red four

Power failure (power

1.

Check that the voltage selector,

times, once every second,

supply is overloaded).

 

located on the rear of the power

followed by a two second

 

 

supply (some models), is set to

pause, and the computer

 

 

the appropriate voltage. Proper

beeps four times.

 

 

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

www.hp.com

2–11