Chapter 10. Troubleshooting and diagnosticsThis chapter describes some basic troubleshooting and diagnostic programs. If your computer problemis not described here, see Chapter 11 “Getting information, help, and service” on page 111 for additionaltroubleshooting resources.Basic troubleshootingThe 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 supporttelephone numbers, refer to the ThinkCentre Safety and Warranty Guide that comes with your computer orgo to the Lenovo Support Web site at http://www.lenovo.com/support/phone.Symptom ActionThe computer does not startwhen you press the powerswitch.Verify that:• The power cord is correctly connected to the rear of the computer and to aworking 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 foryour country or region.The monitor screen is blank. Verify that:• The monitor signal cable is correctly connected to the monitor and to theappropriate monitor connector on the computer.• The monitor power cord is correctly connected to the monitor and to a workingelectrical outlet.• The monitor is turned on and the brightness and contrast controls are setcorrectly.• The computer voltage matches the voltage available at the electrical outlet foryour country or region.• If your computer has two monitor connectors, be sure to use the connectoron the graphics card.The keyboard does not work. Verify that:• The computer is turned on.• The keyboard is securely connected to a USB connector on the computer.• No keys are stuck.The mouse does not work. Verify that:• The computer is turned on.• The mouse is securely connected to a USB connector on the computer.• The mouse is clean. Refer to “Optical mouse” on page 87 for further information.© Copyright Lenovo 2011 91
