Univex 1739, 1962, 1966, 1782, 1942, 1837, 1741 Troubleshooting and diagnostics, Basic troubleshooting

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Chapter 10. Troubleshooting and diagnostics

This chapter describes some basic troubleshooting and diagnostic programs. If your computer problem is not described here, see Chapter 11 “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

• The power cord is correctly connected to the rear of the computer and to a

switch.

working 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 for

 

your country or region.

 

 

The monitor screen is blank.

Verify that:

 

• The monitor signal cable is correctly connected to the monitor and to the

 

appropriate monitor connector on the computer.

 

• The monitor power cord is correctly connected to the monitor and to a working

 

electrical outlet.

 

• The monitor is turned on and the brightness and contrast controls are set

 

correctly.

 

• The computer voltage matches the voltage available at the electrical outlet for

 

your country or region.

 

• If your computer has two monitor connectors, be sure to use the connector

 

on 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 51 for further information.

 

 

© Copyright Lenovo 2011, 2012

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Contents ThinkCentre User Guide Fourth Edition June Copyright Lenovo 2011 Contents Appendix A. Notices Appendix E. Energy Star model information Index Iv ThinkCentre User Guide Static electricity prevention Important safety informationService and upgrades Extension cords and related devices Power cords and power adaptersHeat and product ventilation Plugs and outletsExternal devices Operating environment Modem safety informationLaser compliance statement Power supply statementCleaning and maintenance ThinkCentre User Guide Product overview FeaturesColor temperature adjustment System management featuresInput/Output I/O features Power supplyPreinstalled operating system Preinstalled software programsSoftware provided by Lenovo SpecificationsSoftware overview Lenovo ThinkVantage Tools Lenovo Solution CenterLenovo Welcome Fingerprint SoftwareThinkVantage Password Manager Product RecoveryThinkVantage Power Manager ThinkVantage Rescue and RecoveryAdobe Reader Antivirus software ThinkVantage System UpdateLocations Communication UtilityFront connector, control, and indicator locations Rear connector locations Locating connectors on the rear of your computerConnector Description Adjusting the computer standMachine type and model label Machine type and model labelThinkCentre User Guide Frequently asked questions Using your computerUsing the keyboard Using Windows shortcut keysUsing the wheel mouse Using a fingerprint readerAdjusting audio About your computer audioSetting the volume from Control Panel Setting the volume from the desktopUsing CDs and DVDs Adding the volume icon to the taskbarRecording a CD or DVD Using the single-touch and multi-touch featurePlaying a CD or DVD Selecting a pre-defined color temperature Color temperature adjustmentUsing the single-touch feature Using the multi-touch featureRed-adjustment Green-adjustment Blue-adjustment Exit Switching to RGB adjustmentMaking brightness adjustment Using your computer ThinkCentre User Guide You and your computer Accessibility and comfortArranging your workspace ComfortElectrical outlets and cable lengths Glare and lightingAir circulation Replacement power cords Voltage-selection switchRegister your computer with Lenovo Moving your computer to another country or regionThinkCentre User Guide Security Security featuresAttaching an integrated cable lock Using passwordsBios passwords Setting the fingerprint reader Windows passwordsUsing and understanding firewalls Protecting data against virusesThinkCentre User Guide Installing external options Installing or replacing hardwareInstalling or replacing hardware Removing the monitor stand Replacing the USB keyboard or mouseConnecting the USB keyboard or mouse Replacing the wireless keyboardReplacing the wireless mouse Opening the battery compartment Obtaining device drivers Creating recovery media Recovery informationCreating and using recovery media Performing a backup operation Using recovery mediaPerforming backup and recovery operations Click the Restore your system from a backup icon Performing a recovery operationUsing the Rescue and Recovery workspace Creating a rescue medium Creating and using a rescue mediumUsing a rescue medium Reinstalling preinstalled device drivers Reinstalling preinstalled applications and device driversReinstalling preinstalled applications Solving recovery problems Reinstalling software programsReinstalling device drivers Recovery information ThinkCentre User Guide Viewing and changing settings Using the Setup Utility programStarting the Setup Utility program Power-On Password Password considerationsAdministrator Password Hard Disk PasswordSelecting a startup device Enabling or disabling a deviceSelecting a temporary startup device Selecting or changing the startup device sequenceExiting from the Setup Utility program Updating system programs Using system programsUpdating flashing the Bios from a disc Click Downloads and drivers Updating flashing the Bios from your operating systemUsing System Update Preventing problemsKeeping your computer current Getting the latest device drivers for your computerBasics Computer Cleaning your computerKeyboard Optical mouseMoving your computer Good maintenance practicesCleaning a glass-screen surface Basic troubleshooting Troubleshooting and diagnosticsTroubleshooting Troubleshooting procedureNo audio in Windows Audio problemsNo audio in DOS applications or games CD problemsSound comes from one external speaker only Black screen instead of DVD video DVD problemsCD or DVD does not work No audio or intermittent audio while playing DVD movie DVD movie will not playPlayback is very slow or choppy Invalid disc or no disc found messageAll or some keys on the keyboard do not work Intermittent problemsKeyboard, mouse, or pointing device problems Mouse or pointing device does not work Wireless keyboard does not workPointer on the screen does not move smoothly with the mouse Fingerprint reader does not workImage appears to be flickering Monitor problemsWrong characters appear on the screen Image is discolored Networking problemsEthernet problems Your computer cannot connect to the network Wake on LAN feature is not workingClick Start Control Panel Click Hardware and Sound Adapter stops working for no apparent reasonBluetooth problems Wireless LAN problemWireless WAN problem An option that was just installed does not work Option problemsSound does not come from the Bluetooth headphone An option that previously worked does not work nowClick Disk Cleanup Performance and lockup problemsInsufficient free hard disk drive space Click Start ComputerExcessive number of fragmented files Printer problemsSerial port problems Software does not work as expected Software problemsDiagnostic programs USB problemsCreating a diagnostic disc Lenovo Solution CenterLenovo ThinkVantage Toolbox PC-Doctor for DOSRunning the diagnostic program from a diagnostic disc ThinkCentre User Guide Getting information, help, and service Using the documentation and diagnostic program Help and serviceCalling for service Lenovo Support Web sitePurchasing additional services Using other servicesThinkCentre User Guide Appendix A. Notices Trademarks Export classification notice Appendix B. Regulatory informationTelevision output notice Electronic emissions noticesIndustry Canada Class B emission compliance statement Additional regulatory information ThinkCentre User Guide Recycling information Appendix C. Weee and recycling informationImportant Weee Information Recycling information for Brazil Battery recycling information for TaiwanBattery recycling information for the European Union ThinkCentre User Guide Ukraine RoHS China RoHS Turkish RoHSIndia RoHS Windows 7 operating system Appendix E. Energy Star model informationThinkCentre User Guide Index Setting, changing, deleting Page 1P0B03427
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