Lenovo 1837, 1938, 1962, 1942, 1782, 1739, 1762, 1665, 1738, 1664 Audio problems, No audio in Windows

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2.Run the diagnostic programs to ensure your computer is operating correctly.

3.Reinstall the new hardware option or software following the manufacturer's instructions.

Select the problem your computer is experiencing from the following list:

•“Audio problems” on page 53

•“CD problems” on page 54

•“DVD problems” on page 55

•“Intermittent problems” on page 57

•“Keyboard, mouse, or pointing device problems” on page 57

•“Monitor problems” on page 59

•“Networking problems” on page 60

•“Option problems” on page 63

•“Performance and lockup problems” on page 64

•“Printer problems” on page 65

•“Serial port problems” on page 65

•“Software problems” on page 66

•“USB problems” on page 67

Audio problems

Select your symptom from the following list:

•“No audio in Windows” on page 53

•“An audio disc or AutoPlay-enabled disc does not automatically play when it is inserted into a drive” on page 54

•“Sound comes from one external speaker only” on page 54

•“No audio in DOS applications or games” on page 54

No audio in Windows

Symptom: No audio in Windows

Actions:

•If you are using powered external speakers that have an On/Off control, verify that the On/Off control is set to the On position and the speaker power cable is connected to a properly grounded, functional ac electrical outlet.

•If your external speakers have a volume control, verify that the volume control is not set too low.

•Double-click the speaker icon in the Windows notification area. A master volume-control window opens. Verify that the Mute settings are not checked and none of the volume settings is set too low.

•Some models have a front audio panel you can use to adjust volume. If you have a front audio panel, verify that the volume is not set too low.

•Verify that your external speakers (and headphones, if used) are connected to the correct audio connector on the computer. Most speaker cables are color-coded to match the connector.

Note: When external-speaker or headphone cables are attached to the audio connector, the internal speaker, if present, is disabled. In most cases, if an audio adapter is installed in one of the expansion slots, the audio function built into the system board is disabled; use the audio jacks on the adapter.

Chapter 10. Troubleshooting and diagnostics 53

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Contents ThinkCentre User Guide Second Edition October Copyright Lenovo Contents Appendix A. Notices Important safety information Service and upgradesStatic electricity prevention Extension cords and related devices Power cords and power adaptersPlugs and outlets External devicesHeat and product ventilation Operating environment Modem safety informationPower supply statement Cleaning and maintenanceLaser compliance statement Viii ThinkCentre User Guide Product overview FeaturesPower supply System management featuresColor temperature adjustment Input/Output I/O featuresPreinstalled operating system Preinstalled software programsSpecifications Software overviewSoftware provided by Lenovo Lenovo Welcome Product RecoveryThinkVantage Password Manager Lenovo ThinkVantage ToolsAdobe Reader Antivirus software Locations Front 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 Using Windows shortcut keys Using your computerFrequently asked questions Using the keyboardAdjusting audio Using the blue ThinkVantage buttonUsing a fingerprint reader Using the wheel mouseAdding the volume icon to the taskbar Setting the volume from the desktopSetting the volume from Control Panel Using CDs and DVDsHandling and storing CD and DVD media Playing a CD or DVDRecording a CD or DVD Using the multi-touch feature Using the single-touch and multi-touch featureColor temperature adjustment Using the single-touch featureRed-adjustment Green-adjustment Blue-adjustment Exit Selecting a pre-defined color temperatureSwitching to RGB adjustment Making brightness adjustmentUsing your computer ThinkCentre User Guide Comfort Accessibility and comfortYou and your computer Arranging your workspaceGlare and lighting Air circulationElectrical outlets and cable lengths Moving your computer to another country or region Voltage-selection switchReplacement power cords Register your computer with LenovoThinkCentre User Guide Security Security featuresUsing passwords Bios passwordsAttaching an integrated cable lock Protecting data against viruses Windows passwordsSetting the fingerprint reader Using and understanding firewallsThinkCentre User Guide Installing or replacing hardware Installing or replacing hardwareInstalling external options Replacing the wireless mouse Replacing the wireless keyboardOpening the battery compartment Obtaining device drivers Closing the battery compartment coverRecovery information Creating and using recovery mediaCreating recovery media Using recovery media Performing backup and recovery operationsPerforming a backup operation Performing a recovery operation Using the Rescue and Recovery workspaceClick the Restore your system from a backup icon Creating and using a rescue medium Using a rescue mediumCreating a rescue medium Reinstalling preinstalled applications and device drivers Reinstalling preinstalled applicationsReinstalling preinstalled device drivers Reinstalling software programs Reinstalling device driversSolving recovery problems Recovery information ThinkCentre User Guide Using the Setup Utility program Starting the Setup Utility programViewing and changing settings Hard Disk Password Password considerationsPower-On Password Administrator PasswordSelecting or changing the startup device sequence Enabling or disabling a deviceSelecting a startup device Selecting a temporary startup deviceExiting from the Setup Utility program Using system programs Updating flashing the Bios from a discUpdating system programs Click Downloads and drivers Updating flashing the Bios from your operating systemGetting the latest device drivers for your computer Preventing problemsUsing System Update Keeping your computer currentBasics Optical mouse Cleaning your computerComputer KeyboardGood maintenance practices Cleaning a glass-screen surfaceMoving your computer Basic troubleshooting Troubleshooting and diagnosticsTroubleshooting Troubleshooting procedureNo audio in Windows Audio problemsCD problems Sound comes from one external speaker onlyNo audio in DOS applications or games DVD problems CD or DVD does not workBlack screen instead of DVD video Invalid disc or no disc found message DVD movie will not playNo audio or intermittent audio while playing DVD movie Playback is very slow or choppyIntermittent problems Keyboard, mouse, or pointing device problemsAll or some keys on the keyboard do not work Fingerprint reader does not work Wireless keyboard does not workMouse or pointing device does not work Pointer on the screen does not move smoothly with the mouseMonitor problems Wrong characters appear on the screenImage appears to be flickering Networking problems Ethernet problemsImage is discolored Adapter stops working for no apparent reason Wake on LAN feature is not workingYour computer cannot connect to the network Click Start Control Panel Click Hardware and SoundWireless LAN problem Wireless WAN problemBluetooth problems An option that previously worked does not work now Option problemsAn option that was just installed does not work Sound does not come from the Bluetooth headphoneClick Start Computer Performance and lockup problemsClick Disk Cleanup Insufficient free hard disk drive spacePrinter problems Serial port problemsExcessive number of fragmented files Software does not work as expected Software problemsDiagnostic programs USB problemsPC-Doctor for DOS Creating a diagnostic discRunning the diagnostic program from a diagnostic disc Lenovo ThinkVantage ToolboxGetting information, help, and service Lenovo Support Web site Help and serviceUsing the documentation and diagnostic programs Calling for servicePurchasing additional services Using other servicesThinkCentre User Guide Appendix A. Notices Trademarks Electronic emissions notices Appendix B. Regulatory informationExport classification notice Television output noticeIndustry Canada Class B emission compliance statement Additional regulatory information ThinkCentre User Guide Appendix C. Weee and recycling information Important information for the European Directive 2002/96/ECRecycling information ThinkCentre User Guide Index Optical mouse cleaning Password Administrator Considerations Page 0B03427
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