User Manual
User Manual
User Manual
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Chapter 10.<br />
Troubleshooting and diagnostics<br />
This chapter describes some basic troubleshooting and diagnostic programs. If your computer problem<br />
is not described here, see Chapter 11 “Getting information, help, and service” on page 75 for additional<br />
troubleshooting resources.<br />
Basic troubleshooting<br />
The following table provides information to help you troubleshoot your computer problems.<br />
Note: If you cannot correct the problem, have the computer serviced. For a list of service and support<br />
telephone numbers, refer to the Safety, Warranty, and Setup Guide that comes with your computer or go to<br />
the Lenovo Support Web site at http://www.lenovo.com/support/phone.<br />
Symptom<br />
The computer does not start<br />
when you press the power<br />
switch.<br />
The monitor screen is blank.<br />
The keyboard does not work.<br />
The mouse does not work.<br />
Verify that:<br />
Action<br />
• The power cord is correctly connected to the rear of the computer and to a<br />
working electrical outlet.<br />
• If your computer has a secondary power switch on the rear of the computer,<br />
make sure that it is switched on.<br />
• The power indicator on the front of the computer is on.<br />
• The computer voltage matches the voltage available at the electrical outlet for<br />
your country or region.<br />
Verify that:<br />
• The monitor signal cable is correctly connected to the monitor and to the<br />
appropriate monitor connector on the computer.<br />
• The monitor power cord is correctly connected to the monitor and to a working<br />
electrical outlet.<br />
• The monitor is turned on and the brightness and contrast controls are set<br />
correctly.<br />
• The computer voltage matches the voltage available at the electrical outlet for<br />
your country or region.<br />
• If your computer has two monitor connectors, be sure to use the connector<br />
on the graphics card.<br />
Verify that:<br />
• The computer is turned on.<br />
• The keyboard is securely connected to a USB connector on the computer.<br />
• No keys are stuck.<br />
Verify that:<br />
• The computer is turned on.<br />
• The mouse is securely connected to a USB connector on the computer.<br />
• The mouse is clean. Refer to “Optical mouse” on page 53 for further information.<br />
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