Lenovo 9935, 9705, 9625, 9421, 9353, 9485, 9623 Troubleshooting and diagnostics, Basic troubleshooting

Page 75

Chapter 6. Troubleshooting and diagnostics

This chapter describes some basic troubleshooting and diagnostic programs. If your computer problem is not described here, see Chapter 7, “Getting information, help, and service,” on page 73 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 ThinkCentre Safety and

Warranty Guide that comes with your computer or go to the Lenovo Support

Web site at http://www.lenovo.com/support/phone.

 

 

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.

 

 

v If your computer has a secondary power switch on the back of the computer,

 

make sure 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.

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 voltage is set to the correct setting for your country.

 

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 option connector rather than the one in the rear of the system

 

board. For more information, see ″Connecting your computer″ in the ThinkCentre

 

Safety and Warranty Guide.

 

 

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.

© Copyright Lenovo 2008, 2009

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Contents ThinkCentre User Guide Page ThinkCentre User Guide Second Edition December Copyright Lenovo 2008 Contents Index Important safety information Vi User Guide Product overview FeaturesConnectivity Security features Environment SpecificationsSoftware provided with your Windows operating system Software overviewLenovo ThinkVantage Toolbox Antivirus software Locations Locating connectors on the front of your computerRear connector locations Locating connectors on the rear of your computerConnector Description Component locations Locating componentsLocating internal drives Locating parts on the system boardShows the locations of the drive bays User Guide Handling static-sensitive devices Installing or replacing hardwareInstalling or replacing hardware Installing external optionsRemoving the computer cover Removing the computer cover Installing or replacing a PCI card Removing and reinstalling the front bezelOpening the PCI card latch What to do next Opening the retaining clips Installing or replacing a memory moduleRemoving the memory module Replacing the batteryInstall a new battery Removing the retaining screws for the power supply assembly Replacing the power supply assemblyReplacing the heat sink and fan assembly Removing the heat sink and fan assembly Replacing the primary hard disk drive Replacing the heat sink and fan assemblyRemoving the primary hard disk drive Installing the primary hard disk drive into the bracket Replacing the secondary hard disk drive Installing the primary hard disk drive and bracketRemoving the secondary hard disk drive Installing the secondary hard disk drive into the bracket Replacing the optical drive Installing the secondary hard disk drive and drive cageRemoving the optical drive Replacing the diskette drive or card reader Removing the diskette drive or card reader Removing the front fan assembly Replacing the front fan assemblyInstalling the front fan assembly Replacing the rear fan assemblyRemoving the rear fan assembly Installing the rear fan assembly Replacing the front audio and USB assemblyRemoving the front audio and USB assembly Removing the old internal speaker Replacing the internal speakerReplacing the keyboard Installing a new internal speakerKeyboard connectors Replacing the mouse Completing the parts replacementReinstalling the computer cover Installing security featuresIntegrated cable lock Integrated cable lockPassword protection Erasing lost or forgotten passwords clearing CmosPadlock Installing or replacing hardware User Guide Recovery information Creating and using recovery mediaCreating recovery media Using recovery media Performing backup and recovery operations Performing a backup operationPerforming a recovery operation Using the Rescue and Recovery workspace Creating rescue media Creating and using rescue mediaCreating and using a recovery repair diskette Using rescue mediaCreating a recovery repair diskette Using a recovery repair disketteInstalling or reinstalling device drivers Solving recovery problems Setting a rescue device in the startup sequenceUsing passwords Using the Setup UtilityStarting the Setup Utility program Viewing and changing settingsSetting, changing, and deleting a password Password considerationsUser Password Administrator PasswordSelecting a temporary startup device Selecting a startup deviceSelecting or changing the startup device sequence Exiting from the Setup Utility programUsing system programs Updating flashing the Bios from a diskette or discUpdating system programs Recovering from a POST/BIOS update failure Updating flashing the Bios from your operating systemUpdating system programs User Guide Basic troubleshooting Troubleshooting and diagnosticsLenovo ThinkVantage Toolbox Diagnostic programsLenovo System Toolbox PC-Doctor for Rescue and RecoveryCleaning the mouse PC-Doctor for DOSOptical mouse Non-optical mouse User Guide Lenovo ThinkVantage Tools Getting information, help, and serviceInformation resources Online Books folderLenovo Welcome Access HelpSafety and Warranty ThinkVantage Productivity CenterHelp and service Using the documentation and diagnostic programsCalling for service Purchasing additional services Using other servicesAppendix. Notices Trademarks Television output noticeCRU IndexPower Page User Guide Page Part Number 89Y0418
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9421, 9953, 9705, 9935, 9795 specifications

Lenovo has established itself as a significant player in the global technology market, particularly with its innovative line of laptops. The models 9353, 3656, 9625, 7061, and 9946 showcase the company's commitment to combining performance, portability, and cutting-edge technology.

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Overall, these Lenovo models cater to different needs and preferences, all while emphasizing performance, portability, and cutting-edge technology, solidifying Lenovo's reputation in the laptop arena.
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