Solving power problems
Common causes and solutions for power problems are listed in the following table.
Computer powered off automatically and the Power LED flashes red two times, once every second, followed by a
two second pause, and the computer beeps two times. (Beeps stop after fifth iteration but LEDs continue flashing.)
Cause
Solution
Processor thermal protection activated:
A fan may be blocked or not turning.
OR
The heat sink is not properly attached to the processor.
1.
Ensure that the computer air vents are not blocked and
the processor cooling fan is running.
2.
Ensure the blower is running.
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 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.
2.
Replace the power supply.
3.
Replace the system board.
Solving hard drive problems
Hard drive error occurs.
Cause
Solution
Hard disk has bad sectors or has failed.
1.
Right-click
Start
, click
Explore
, and right-click on a
drive. Select
Properties
then select the
Tools
tab.
Under
Error-checking
click
Check Now
.
2.
Use a utility to locate and block usage of bad sectors. If
necessary, reformat the hard disk.
Disk transaction problem.
Cause
Solution
Either the directory structure is bad or there is a problem with
a file.
Right-click
Start
, click
Explore
, and right-click on a drive.
Select
Properties
then select the
Tools
tab. Under
Error-
checking
click
Check Now
.
110 Appendix G Troubleshooting without diagnostics
