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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.
156 Chapter 8 Troubleshooting without diagnostics