Chapter 5. Troubleshooting And Diagnostics; Basic Troubleshooting - Lenovo ThinkCentre Edge 72z Hardware Maintenance Manual

Chapter 5. Troubleshooting and diagnostics

This chapter describes some basic troubleshooting and diagnostic programs. If your computer problem is
not described here, see "Diagnostics" on page 51 for additional troubleshooting resources.

Basic troubleshooting

The following table provides information to help you troubleshoot your computer problems.
Note: If you cannot correct the problem, have the computer serviced. For a list of service and support
telephone numbers, refer to the Safety, Warranty, and Setup Guide that comes with your computer or go to
the Lenovo Support Web site at http://www.lenovo.com/support/phone.
Symptom
The computer does not start
when you press the power
switch.
The monitor screen is blank.
The keyboard does not work.
The mouse does not work.
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Verify that:
• The power cord is correctly connected to the rear of the computer and to a
working electrical outlet.
• If your computer has a secondary power switch on the rear of the computer,
make sure that it is switched on.
• The power indicator on the front of the computer is on.
• The computer voltage matches the voltage available at the electrical outlet for
your country or region.
Verify that:
• The monitor power cord is correctly connected to the monitor and to a working
electrical outlet.
• The monitor is turned on and the brightness and contrast controls are set
correctly.
• The computer voltage matches the voltage available at the electrical outlet for
your country or region.
Verify that:
• The computer is turned on.
• The keyboard is securely connected to a USB connector on the computer.
• No keys are stuck.
Verify that:
• The computer is turned on.
• The mouse is securely connected to a USB connector on the computer.
• The mouse is clean.
Action
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