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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. If equipped with a voltage selector, 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 access panel and ensure the 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 drives or optical

drives and expansion cards). Power on the system. If the

system enters 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.

Solving hard drive problems

Hard drive error occurs.

Cause Solution

Hard disk has bad sectors or has failed. 1. In Windows 7, click Start, click Computer, and right-

click on a drive. Select Properties, and then select the

Tools tab. Under Error-checking click Check Now.

In Windows 8, on the Start screen type e, and then

select File Explorer from the list of applications. In the

left column, expand Computer, right-click on a drive,

select Properties, and then select the Tools tab. Under

Error checking click Check.

2. Use a utility to locate and block usage of bad sectors. If

necessary, reformat the hard disk.

154 Chapter 8 Troubleshooting without diagnostics

HP ProDesk 600 G1 Small Form Factor User Manual

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