Chapter 5. Troubleshooting and diagnosticsThis chapter provides information about diagnosing and troubleshooting computer problems. If yourcomputer problem is not described here, see “Lenovo Support Web site” on page 33 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 Safety, Warranty, and Setup Guide that comes with your computer or go tothe 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,ensure 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 45 for further information.© Copyright Lenovo 2013 37
