Univex 1782X01, 1962, 1966, 1942, 1837, 1741 Monitor problems, Wrong characters appear on the screen

Page 73

Monitor problems

Note: Many monitors have status-indicator lights and built-in controls for adjusting brightness, contrast, width, height, and other picture adjustments. However, the controls vary from monitor type to monitor type. For information about the status lights and using the controls, refer to the documentation that comes with your monitor.

Select your symptom from the following list:

•“Wrong characters appear on the screen” on page 61

•“The monitor works when you turn on the computer, but goes blank after some period of computer inactivity” on page 61

•“The monitor works when you turn on the computer, but goes blank when you start some application programs” on page 61

•“The image appears to be flickering” on page 61

•“The image is discolored” on page 62

Wrong characters appear on the screen

Symptom: Wrong characters appear on the screen.

Action: Have the computer serviced. For details, see Chapter 11 “Getting information, help, and service” on page 73.

The monitor works when you turn on the computer, but goes blank after some period of computer inactivity

Symptom: The monitor works when you turn on the computer, but goes blank after some period of computer inactivity.

Action: The computer is probably set for energy savings with the power-management feature. If the power-management feature is enabled, disabling it or changing the settings might solve the problem.

If these actions do not correct the problem, run the diagnostic programs (see “Diagnostic programs” on page 69 for instructions). If you need technical assistance, see Chapter 11 “Getting information, help, and service” on page 73.

The monitor works when you turn on the computer, but goes blank when you start some application programs

Symptom: The monitor works when you turn on the computer, but goes blank when you start some application programs.

Actions:

•Make sure the monitor signal cable is securely connected to the monitor and the monitor connector on the computer. A loose cable can cause intermittent problems.

•Verify that the necessary device drivers for the application programs are installed. Refer to the documentation for the affected application program to see if device drivers are required.

If these actions do not correct the problem, run the diagnostic programs (see “Diagnostic programs” on page 69 for instructions). If you need technical assistance, see Chapter 11 “Getting information, help, and service” on page 73.

The image appears to be flickering

Symptom: The image appears to be flickering.

Chapter 10. Troubleshooting and diagnostics 61

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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 Service and upgrades Important safety informationStatic electricity prevention Extension cords and related devices Power cords and power adaptersExternal devices Plugs and outletsHeat and product ventilation Operating environment Modem safety informationCleaning and maintenance Power supply statementLaser compliance statement ThinkCentre User Guide Product overview FeaturesColor temperature adjustment System management featuresInput/Output I/O features Power supplyPreinstalled operating system Preinstalled software programsSoftware overview SpecificationsSoftware provided by Lenovo 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 taskbarPlaying a CD or DVD Using the single-touch and multi-touch featureRecording a CD or DVD Selecting a pre-defined color temperature Color temperature adjustmentUsing the single-touch feature Using the multi-touch featureMaking brightness adjustment Switching to RGB adjustmentRed-adjustment Green-adjustment Blue-adjustment Exit Using your computer ThinkCentre User Guide You and your computer Accessibility and comfortArranging your workspace ComfortAir circulation Glare and lightingElectrical outlets and cable lengths Replacement power cords Voltage-selection switchRegister your computer with Lenovo Moving your computer to another country or regionThinkCentre User Guide Security Security featuresBios passwords Using passwordsAttaching an integrated cable lock Setting the fingerprint reader Windows passwordsUsing and understanding firewalls Protecting data against virusesThinkCentre User Guide Installing or replacing hardware Installing or replacing hardwareInstalling external options 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 and using recovery media Recovery informationCreating recovery media Performing backup and recovery operations Using recovery mediaPerforming a backup operation Using the Rescue and Recovery workspace Performing a recovery operationClick the Restore your system from a backup icon Using a rescue medium Creating and using a rescue mediumCreating a rescue medium Reinstalling preinstalled applications Reinstalling preinstalled applications and device driversReinstalling preinstalled device drivers Reinstalling device drivers Reinstalling software programsSolving recovery problems Recovery information ThinkCentre User Guide Starting the Setup Utility program Using the Setup Utility programViewing and changing settings 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 flashing the Bios from a disc Using system programsUpdating system programs 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 mouseCleaning a glass-screen surface Good maintenance practicesMoving your computer Basic troubleshooting Troubleshooting and diagnosticsTroubleshooting Troubleshooting procedureNo audio in Windows Audio problemsSound comes from one external speaker only CD problemsNo audio in DOS applications or games CD or DVD does not work DVD problemsBlack screen instead of DVD video 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 messageKeyboard, mouse, or pointing device problems Intermittent problemsAll or some keys on the keyboard do not work 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 workWrong characters appear on the screen Monitor problemsImage appears to be flickering Ethernet problems Networking problemsImage is discolored 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 reasonWireless WAN problem Wireless LAN problemBluetooth problems 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 ComputerSerial port problems Printer problemsExcessive number of fragmented files 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 Important Weee Information Appendix C. Weee and recycling informationRecycling 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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