Power LED flashes Red four times, once every second, followed by a two second pause, and the computer beeps four times. (Beeps stop after fifth iteration but LEDs continue flashing.)

Cause

Solution

 

 

 

Power failure (power supply is overloaded).

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- or 6-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.

Replace the power supply.

 

5.

Replace the system board.

 

 

The incorrect external power supply adapter is being used on

The USDT power supply adapter must be at 135W and use

the USDT.

the Smart ID technology before the system will power up.

 

Replace the power supply adapter with the HP-supplied

 

USDT power supply adapter.

 

 

 

256 Chapter 10 Troubleshooting Without Diagnostics