Lenovo 8995, 6490, 9635 Troubleshooting and diagnostics, Basic troubleshooting, Symptom Action

Page 73

Chapter 7. Troubleshooting and diagnostics

This chapter describes some basic troubleshooting and diagnostic programs. If your computer problem is not described here, see Chapter 8, “Getting information, help, and service,” on page 59 for additional troubleshooting resources.

Basic troubleshooting

The following table provides information to help you troubleshoot your computer problem.

Symptom	Action

The computer does not start	Verify that:
when you press the power	v The power cord is plugged into the rear of the computer and into a working
button.	electrical outlet.
	electrical outlet.
	v If your computer has a secondary power switch on the back of the computer,
	ensure that it is switched on.
	v The power indicator on the front of the computer is on.
	v The voltage is set to the correct setting for your country.
	If you cannot correct the problem, have the computer serviced. Refer to the
	safety and warranty information that is provided with your computer for a list of
	service and support telephone numbers.

The monitor screen is blank.	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.
	Note: If your computer has two monitor connectors, verify that your monitor is
	connected to the one in the AGP option connector rather than the one in the rear
	of the system board. For more information, “Connecting your computer” on page
	3.
	If you cannot correct the problem, have the computer serviced. Refer to the
	safety and warranty information that is provided with your computer for a list of
	service and support telephone numbers.

The keyboard does not work.	Verify that:
The computer does not respond	v The computer is turned on.
to the keyboard.	v The monitor is turned on and the brightness and contrast controls are set

	correctly.
	v The keyboard is securely connected to the keyboard connector on the
	computer.
	v No keys are stuck.
	If you cannot correct the problem, have the computer serviced. Refer to the
	safety and warranty information that is provided with your computer for a list of
	service and support telephone numbers.

© Lenovo 2006, 2007. Portions © IBM Corp. 2005.

53

Image 73

Contents User Guide Page User Guide Page Contents Troubleshooting Conditions that require immediate action Important safety informationService and upgrades General safety guidelinesStatic electricity prevention Power cords and power adaptersVoltage-selection switch Plugs and outlets Extension cords and related devicesExternal devices BatteriesHeat and product ventilation Operating environment Electrical current safety informationModem safety information Lithium battery noticeTo connect To disconnect Products with television tuner options installed Power supply statementLaser compliance statement Proper grounding for the cable Example of antenna groundingCleaning and maintenance Data safetyUsing headphones or earphones Additional safety information Introduction Xviii User Guide Comfort Arranging your workspaceAir circulation Glare and lightingElectrical outlets and cable lengths Connecting your computer Setting up your computerUser Guide Setting up your computer User Guide 1394 Finishing the software installation Turning on powerCompleting important tasks Installing other operating systemsUpdating your operating system Updating your antivirus softwareUser Guide Features Installing optionsVideo subsystem Operating systems preinstalled varies by model type Dimensions SpecificationsWeight EnvironmentTools required Available optionsHandling static-sensitive devices Installing external optionsLocating the connectors on the front of your computer Locating the connectors on the rear of your computer Obtaining device drivers Connector DescriptionRemoving the cover Locating components Identifying parts on the system board Installing options User Guide What to do next Installing memoryInstalling adapters What to do next Drive specifications Installing internal drivesInstalling options Installing a drive in bay 1 or bay Installing options Connecting the first optical drive Connecting drivesInstalling security features Connecting a serial ATA hard disk driveIntegrated cable lock Changing the battery Password protectionPadlock Erasing a lost or forgotten password clearing Cmos Replacing the cover and connecting the cables User Guide Creating and using the Product Recovery disc Recovering softwarePerforming backup and recovery operations Using the Rescue and Recovery workspace Creating and using rescue media To create rescue media, do the following Creating and using a Recovery Repair disketteRecovering or installing device drivers Solving recovery problems Setting a rescue device in the startup sequenceUser Guide Starting the Setup Utility program Using the Setup UtilityViewing and changing settings Using passwordsAdministrator Password User PasswordSetting, changing, and deleting a password Using Security Profile by DeviceSelecting a temporary startup device Selecting a startup deviceChanging the startup device sequence Exiting from the Setup Utility program Advanced settingsUpdating flashing Bios from a diskette Using system programsUpdating system programs User Guide Basic troubleshooting Troubleshooting and diagnosticsSymptom Action Diagnostic programs PC-Doctor for DOS PC-Doctor for WindowsRunning diagnostics from the CD or diskettes PC-Doctor for Windows PE Cleaning the mouseOptical mouse Non-optical mouse1 Retainer ring 2 Ball 3 Plastic rollers 4 Ball cage Information resources Getting information, help, and serviceOnline Books folder ThinkVantage Productivity CenterSafety and warranty Access HelpHelp and service Calling for service Using the documentation and diagnostic programsPurchasing additional services Using other servicesBasic AT commands Appendix A. Manual modem commandsSet Pulse dial as default Low speaker volumeSet Tone Dial as default Internal speaker on until carrier detectedExtended AT commands MNP/V.42/V.42bis/V.44 commands Fax Class 2 commands Fax Class 1 commandsVoice commands Appendix A. Manual modem commands User Guide Appendix B. Notices Trademarks Television output noticeIndex Page Page Part Number