Dell D420 Sound and Speaker Problems, Touch Pad or Mouse Problems, No sound from headphones

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Reinstall the scanner driver — See the scanner documentation for instructions.

Sound and Speaker Problems

Fill out the Diagnostics Checklist (see Diagnostics Checklist) as you complete these checks.

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

No sound from integrated speakers

Adjust the Windows volume control — Double-click the speaker icon in the lower-right corner of your screen. Ensure that the volume is turned up and that the sound is not muted. Adjust the volume, bass, or treble controls to eliminate distortion.

Reinstall the sound (audio) driver — See Reinstalling Drivers and Utilities.

No sound from external speakers

Ensure that the subwoofer and the speakers are turned on — See the setup diagram supplied with the speakers. If your speakers have volume controls, adjust the volume, bass, or treble to eliminate distortion.

Adjust the Windows volume control — Click or double-click the speaker icon in the lower-right corner of your screen. Ensure that the volume is turned up and that the sound is not muted.

Disconnect headphones from the headphone connector — Sound from the speakers is automatically disabled when headphones are connected to the computer's front-panel headphone connector.

Test the electrical outlet — Ensure that the electrical outlet is working by testing it with another device, such as a lamp.

Eliminate possible interference — Turn off nearby fans, fluorescent lights, or halogen lamps to check for interference.

Reinstall the audio driver — See Reinstalling Drivers and Utilities.

Run the Dell Diagnostics — See Dell Diagnostics.

NOTE: The volume control in some MP3 players overrides the Windows volume setting. If you have been listening to MP3 songs, ensure that you did not turn the player volume down or off.

No sound from headphones

Check the headphone cable connection — Ensure that the headphone cable is securely inserted into the headphone connector.

Adjust the Windows volume control — Click or double-click the speaker icon in the lower-right corner of your screen. Ensure that the volume is turned up and that the sound is not muted.

Touch Pad or Mouse Problems

Check the touch pad settings —

1.Click Start→ Control Panel→ Printers and Other Hardware→ Mouse.

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Contents Dell Latitude D420 Users Guide Abbreviations and AcronymsDevice status lights About Your ComputerFront View Fingerprint reader optional Keyboard and network status lightsRight View Audio connectorsLeft View Network connector RJ-45 USB connectorsModem connector RJ-11 Video connectorBottom View Back to Contents Cleaning Your Computer AppendixFCC Class B Macrovision Product NoticeFCC Notice U.S. Only Checking the Battery Charge Using a BatteryBattery Performance Dell QuickSet Battery MeterLow-Battery Warning Conserving Battery PowerPower Management Modes Standby ModeReplacing the Battery Configuring Power Management SettingsCharging the Battery Hibernate ModeStoring a Battery Card Types Using CardsInstalling a PC Card or 34-mm ExpressCard Card BlanksInstalling a 34-mm Express Card Installing a Smart Card or Secure Digital SD CardInstalling a PC Card Removing a PC Card, 34-mm Express Card, or Blank Back to Contents Switching the Video Image Using the DisplayAdjusting Brightness Setting Display Resolution and Refresh RateSwapping Primary and Secondary Displays Finding Information What Are You Looking For? Find It HereDell Support Website support.dell.com Service Tag and Microsoft Windows LicenseGuides Select Drivers & Downloads and click GoOperating System CD Glossary Device driver See driver Docking device See APRPage Page NIC See network adapter Page Video resolution See resolution System tray See notification areaBack to Contents Obtaining Assistance Online ServicesGetting Help Ftp.dell.comAutomated Order-Status Service Problems With Your OrderAutoTech Service Support ServiceContacting Dell Diagnostics ChecklistBefore You Call Antigua and Barbuda0011 ArubaAustralia Sydney Website support.euro.dell.comCosta Rica China XiamenColombia Czech Republic PragueGermany Langen France Paris MontpellierCorporate GreeceJamaica GeneralItaly Milan Website support.jp.dell.comMexico MacaoWebsite support.ap.dell.com Malaysia Penang MontserratSt. Lucia Puerto RicoSt. Kitts and Nevis St. VincentWebsite support.ap.dell.com Thailand Website support.ap.dell.com Taiwan002 Trinidad/TobagoVirgin Islands VenezuelaKey Combinations Using the Keyboard and Touch PadNumeric Keypad Fingerprint Reader optional Power ManagementTouch Pad Speaker FunctionsMouse Properties window Changing the Track-Stick CapCustomizing the Touch Pad and Track Stick Page Network Setup Wizard Setting Up a NetworkPhysically Connecting to a Network or Broadband Modem Wireless Local Area Network WlanWhat You Need to Establish a Wlan Connection Checking Your Wireless Network CardSetting Up a New Wlan Connecting to a Wireless Local Area Network Determining the Wireless Network Device ManagerConnecting to a Mobile Broadband Network Mobile Broadband or Wireless Wide Area Network WwanEnabling/Disabling the Wireless Network Card Under Pick a Help topic, click Dell User and System GuidesDell Wi-Fi Catcher Network Locator Internet Connection FirewallRecommended Tools Adding and Replacing PartsBefore You Begin Turning Off Your ComputerHard Drive Removing the Hard Drive Dismantling the Hard Drive Replacing the Hard Drive Hinge CoverKeyboard MemoryPage Wireless Local Area Network Wlan Cards Mini-CardsMobile Broadband Wwan Cards Page Subscriber Identity Module SIM Card Internal Card With Bluetooth Wireless Technology Coin-Cell BatteryBack to Contents Dell QuickSet Securing Your Computer Using Smart CardsPasswords Security Cable LockUsing a Hard Drive Password Using a Primary/System PasswordUsing an Administrator Password Trusted Platform Module TPMSecurity Management Software Enabling the TPM FeatureUsing the Security Management Software Activating the Security Management SoftwareComputer Tracking Software If Your Computer Is Lost or StolenSystem Setup Screens System Setup ProgramViewing the System Setup Screens Commonly Used SettingsEnabling the Infrared Sensor Performing a One-Time BootChanging COM Ports Locate Fast IR under Onboard DevicesPage Reinstalling Drivers and Utilities Reinstalling SoftwareWhat Is a Driver? DriversSoftware and Hardware Incompatibilities Using the Drivers and Utilities CDManually Reinstalling Drivers Click Start→ Help and SupportUndoing the Last System Restore Using Microsoft Windows XP System RestoreCreating a Restore Point Restoring Your Operating SystemReinstalling Windows XP Using the Operating System CDEnabling System Restore Before You BeginSpecifications Audio CommunicationsVideo DisplayBattery AC AdapterPhysical EnvironmentalAbbreviations and Acronyms Start the Files and Settings Transfer Wizard Transferring Information to a New ComputerClick Files and Settings Transfer Wizard Back to Contents Packing the Computer Traveling With Your ComputerIdentifying Your Computer Travel TipsBack to Contents Dell Diagnostics TroubleshootingDell Technical Update Service When to Use the Dell DiagnosticsDell Diagnostics Main Menu Option FunctionDell Support Utility Drive ProblemsAccessing the Dell Support Utility Clicking the Dell Support IconProblems writing to a CD/DVD-RW drive CD and DVD drive problemsHard drive problems If you hear an unfamiliar scraping or grinding soundVerify that the modem is communicating with Windows Mail, Modem, and Internet ProblemsError Messages Page Click Start→ Control Panel→ Add or Remove Programs External Keyboard problems Ieee 1394 Device ProblemsKeyboard Problems Computer does not start up Lockups and Software ProblemsUnexpected characters Computer stops respondingOther software problems Memory ProblemsNetwork Problems Solid blue screen appears Mobile Broadband Network PC Card or ExpressCard Problems Wireless Local Area Network Wlan Restart the computer and log on to the network againDocking Power Considerations Power ProblemsEnsuring Sufficient Power for Your Computer AC Power Loss While the Computer Is Docked Printer ProblemsScanner Problems Docking While the Computer Is RunningNo sound from headphones Sound and Speaker ProblemsTouch Pad or Mouse Problems No sound from integrated speakersIf the display is difficult to read Video and Display ProblemsIf the display is blank Click Start→ Control Panel→ Appearance and Themes Adjust the Windows display settingsIf only part of the display is readable Connect an external monitor

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