Univex 1677, 1962, 1966, 1942, 1837, 1782X01, 1741, 1762, 1738 Audio problems, No audio in Windows

Page 67

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 55

•“CD problems” on page 56

•“DVD problems” on page 57

•“Intermittent problems” on page 59

•“Keyboard, mouse, or pointing device problems” on page 59

•“Monitor problems” on page 61

•“Networking problems” on page 62

•“Option problems” on page 65

•“Performance and lockup problems” on page 66

•“Printer problems” on page 67

•“Serial port problems” on page 67

•“Software problems” on page 68

•“USB problems” on page 69

Audio problems

Select your symptom from the following list:

•“No audio in Windows” on page 55

•“An audio disc or AutoPlay-enabled disc does not automatically play when it is inserted into a drive” on page 56

•“Sound comes from one external speaker only” on page 56

•“No audio in DOS applications or games” on page 56

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 55

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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 FeaturesPower supply System management featuresColor temperature adjustment Input/Output I/O featuresPreinstalled operating system Preinstalled software programsSoftware overview SpecificationsSoftware provided by Lenovo Fingerprint Software Lenovo Solution CenterLenovo ThinkVantage Tools Lenovo WelcomeThinkVantage Rescue and Recovery Product RecoveryThinkVantage Password Manager ThinkVantage Power ManagerCommunication Utility ThinkVantage System UpdateAdobe Reader Antivirus software LocationsFront 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 keyboardAbout your computer audio Using a fingerprint readerUsing the wheel mouse Adjusting audioAdding the volume icon to the taskbar Setting the volume from the desktopSetting the volume from Control Panel Using CDs and DVDsPlaying a CD or DVD Using the single-touch and multi-touch featureRecording a CD or DVD Using the multi-touch feature Color temperature adjustmentSelecting a pre-defined color temperature Using the single-touch featureMaking brightness adjustment Switching to RGB adjustmentRed-adjustment Green-adjustment Blue-adjustment Exit Using your computer ThinkCentre User Guide Comfort Accessibility and comfortYou and your computer Arranging your workspaceAir circulation Glare and lightingElectrical 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 featuresBios passwords Using 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 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 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 Updating flashing the Bios from a disc Using system programsUpdating 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 KeyboardCleaning 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 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 choppyKeyboard, mouse, or pointing device problems Intermittent 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 mouseWrong characters appear on the screen Monitor problemsImage appears to be flickering Ethernet problems Networking 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 WAN problem Wireless LAN 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 spaceSerial port problems Printer problemsExcessive number of fragmented files Software does not work as expected Software problemsDiagnostic programs USB problemsPC-Doctor for DOS Lenovo Solution CenterCreating a diagnostic disc Lenovo ThinkVantage ToolboxRunning the diagnostic program from a diagnostic disc ThinkCentre User Guide Getting information, help, and service Lenovo Support Web site Help and serviceUsing the documentation and diagnostic program 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 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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