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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.) Computer powered off automatically and the Power LED flashes red three times and then
white four times.
Cause
Power failure (power supply is overloaded).
Solving hard drive problems
Hard drive error occurs.
Cause
Hard disk has bad sectors or has failed.
Disk transaction problem.
Cause
Either the directory structure is bad or there is a problem with a file.
Drive not found (identified).
Cause
Cable could be loose.
The system may not have automatically recognized a newly
installed device.
70
Chapter 6 Troubleshooting without diagnostics
Solution
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). 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.
Solution
1.
Type file in the taskbar search box, and then select File
Explorer from the list of applications. In the left column,
expand This PC, 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.
Solution
Type file in the taskbar search box, and then select File Explorer
from the list of applications. In the left column, expand This PC,
right-click a drive, select Properties, and then select the Tools tab.
Under Error checking, click Check.
Solution
Check cable connections.
See reconfiguration directions in the
problems on page 82
section. If the system still does not
recognize the new device, check to see if the device is listed within
Solving hardware installation
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