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140 Chapter 4
Power On Issue
If the system doesn’t power on, perform the following actions one at a time to correct the problem. Do not
replace non-defective FRUs:
Computer Shuts down Intermittently
If the system powers off at intervals, perform the following actions one at a time to correct the problem.
1. Check the power cable is properly connected to the computer and the electrical outlet.
2. Remove any extension cables between the computer and the outlet.
3. Remove any surge protectors between the computer and the electrical outlet. Plug the computer directly
into a known good electrical outlet.
4. Disconnect the power and open the casing to check the Thermal Unit (see “Thermal Unit Failure” on page
157) and fan airways are free of obstructions.
5. Remove all external and non-essential hardware connected to the computer that are not necessary to
boot the computer to the failure point.
6. Remove any recently installed software.
7. If the Issue is still not resolved, see “Online Support Information” on page 207.
Start
Check
AC/Batt only
power on
Swap
AC/Battery
OK
NG
Check
Power/B
Whether OK
OK
Swap Power
SW/B
OK
NG
Swap M/B
Start
Check
AC/Batt only
power on
Swap
AC/Battery
OK
NG
Check
Power/B
Whether OK
OK
Swap Power
SW/B
OK
NG
Swap M/B