Chapter 5. Troubleshooting And Diagnostics; Basic Troubleshooting - Lenovo ThinkCentre A52 Quick Reference Manual

Chapter 5. Troubleshooting and diagnostics

This chapter describes some basic troubleshooting and diagnostic tools. If your
computer problem is not described here, use Access Help for more detailed
troubleshooting information or see "Additional help" on page xv.

Basic troubleshooting

Symptom
The computer does not
start when you press the
power button.
The monitor screen is
blank.
© Lenovo 2005, 2006. Portions © IBM Corp. 2005.
Action
Verify that:
v The power cord is plugged into the rear of the computer
and into a working electrical outlet.
v If your computer has a secondary power switch on the
back of the computer, ensure that it is switched on. Check
the power indicator on the front of the computer to ensure
that the power is on.
v The power supply and system board are working. See
"Power Supply and System board Diagnostic LEDs" on
page 25.
If you cannot correct the problem, have the computer
serviced.
Verify that:
v The monitor cable is securely attached to the rear of the
monitor and to the rear of the computer.
v The monitor power cord is plugged into the monitor and
into a working electrical outlet.
v The monitor is turned on, and the brightness and contrast
controls are set correctly.
v The monitor signal cable is securely connected to the
monitor and to the monitor connector on the computer.
v The power supply and system board are working. See
"Power Supply and System board Diagnostic LEDs" on
page 25.
Note: If your computer has two monitor connectors, verify
that your monitor is connected to the one in the PCI-express
(PCI-e) option connector rather than the one in the rear of
the system board. See Step 4 on page 3.
If you cannot correct the problem, have the computer
serviced.
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