Dell D420 specifications Power Problems, Ensuring Sufficient Power for Your Computer

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If you have problems with a Dell-provided Card — Contact Dell (see Contacting Dell).

If you have problems with a Card not provided by Dell — Contact the card manufacturer.

Power 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.

Check the power light — When the power light is lit or blinking, the computer has power. If the power light is blinking, the computer is in standby mode; press the power button to exit standby mode. If the light is off, press the power button to turn on the computer.

Charge the battery — The battery charge may be depleted.

1.Reinstall the battery.

2.Use the AC adapter to connect the computer to an electrical outlet.

3.Turn on the computer.

NOTE: Battery operating time (the time the battery can hold a charge) decreases over time. Depending on how often the battery is used and the conditions under which it is used, you may need to purchase a new battery during the life of your computer.

Check the battery status light — If the battery status light flashes orange or is a steady orange, the battery charge is low or depleted. Connect the computer to an electrical outlet.

If the battery status light flashes green and orange, the battery is too hot to charge. Shut down the computer, disconnect the computer from the electrical outlet, and then let the battery and computer cool to room temperature.

If the battery status light rapidly flashes orange, the battery may be defective. Contact Dell (see Contacting Dell).

Check the battery temperature — If the battery temperature is below 0° C (32° F), the computer will not start up.

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

Check the AC adapter — Check the AC adapter cable connections. If the AC adapter has a light, ensure that the light is on.

Connect the computer directly to an electrical outlet — Bypass power protection devices, power strips, and the extension cable to verify that the computer turns on.

Eliminate possible interference — Turn off nearby fans, fluorescent lights, halogen lamps, or other appliances.

Adjust the power properties — See Configuring Power Management Settings.

Reseat the memory modules — If the computer power light turns on but the display remains blank, reinstall the memory modules (see Memory).

Ensuring Sufficient Power for Your Computer

Your computer is designed to use a 65-W or 90-W AC adapter. However, for optimum system performance, you should always use a 90-W adapter.

Using less-powerful AC adapters will cause you to receive a WARNING message.

Docking Power Considerations

Your computer supports use of a Dell D/Port advanced port replicator. Due to the extra power consumption when a computer is docked to a docking device,

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Contents Dell Latitude D420 Users Guide Abbreviations and AcronymsAbout Your Computer Front ViewDevice status lights Fingerprint reader optional Keyboard and network status lightsAudio connectors Left ViewRight View USB connectors Modem connector RJ-11Network connector RJ-45 Video connectorBottom View Back to Contents Cleaning Your Computer AppendixMacrovision Product Notice FCC Notice U.S. OnlyFCC Class B Using a Battery Battery PerformanceChecking the Battery Charge Dell QuickSet Battery MeterConserving Battery Power Power Management ModesLow-Battery Warning Standby ModeConfiguring Power Management Settings Charging the BatteryReplacing the Battery Hibernate ModeStoring a Battery Using Cards Installing a PC Card or 34-mm ExpressCardCard Types Card BlanksInstalling a Smart Card or Secure Digital SD Card Installing a PC CardInstalling a 34-mm Express Card Removing a PC Card, 34-mm Express Card, or Blank Back to Contents Using the Display Adjusting BrightnessSwitching the Video Image Setting Display Resolution and Refresh RateSwapping Primary and Secondary Displays Finding Information What Are You Looking For? Find It HereService Tag and Microsoft Windows License GuidesDell Support Website support.dell.com 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 Online Services Getting HelpObtaining Assistance Ftp.dell.comProblems With Your Order AutoTech ServiceAutomated Order-Status Service Support ServiceDiagnostics Checklist Before You CallContacting Dell Antigua and BarbudaAruba Australia Sydney0011 Website support.euro.dell.comChina Xiamen ColombiaCosta Rica Czech Republic PragueFrance Paris Montpellier CorporateGermany Langen GreeceGeneral Italy MilanJamaica Website support.jp.dell.comMacao Website support.ap.dell.com Malaysia PenangMexico MontserratPuerto Rico St. Kitts and NevisSt. Lucia St. VincentWebsite support.ap.dell.com Taiwan 002Website support.ap.dell.com Thailand Trinidad/TobagoVirgin Islands VenezuelaUsing the Keyboard and Touch Pad Numeric KeypadKey Combinations Power Management Touch PadFingerprint Reader optional Speaker FunctionsChanging the Track-Stick Cap Customizing the Touch Pad and Track StickMouse Properties window Page Setting Up a Network Physically Connecting to a Network or Broadband ModemNetwork Setup Wizard Wireless Local Area Network WlanChecking Your Wireless Network Card Setting Up a New WlanWhat You Need to Establish a Wlan Connection Connecting to a Wireless Local Area Network Determining the Wireless Network Device ManagerMobile Broadband or Wireless Wide Area Network Wwan Enabling/Disabling the Wireless Network CardConnecting to a Mobile Broadband Network Under Pick a Help topic, click Dell User and System GuidesDell Wi-Fi Catcher Network Locator Internet Connection FirewallAdding and Replacing Parts Before You BeginRecommended Tools 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 Using Smart Cards PasswordsSecuring Your Computer Security Cable LockUsing a Primary/System Password Using an Administrator PasswordUsing a Hard Drive Password Trusted Platform Module TPMEnabling the TPM Feature Using the Security Management SoftwareSecurity Management Software Activating the Security Management SoftwareComputer Tracking Software If Your Computer Is Lost or StolenSystem Setup Program Viewing the System Setup ScreensSystem Setup Screens Commonly Used SettingsPerforming a One-Time Boot Changing COM PortsEnabling the Infrared Sensor Locate Fast IR under Onboard DevicesPage Reinstalling Software What Is a Driver?Reinstalling Drivers and Utilities DriversUsing the Drivers and Utilities CD Manually Reinstalling DriversSoftware and Hardware Incompatibilities Click Start→ Help and SupportUsing Microsoft Windows XP System Restore Creating a Restore PointUndoing the Last System Restore Restoring Your Operating SystemUsing the Operating System CD Enabling System RestoreReinstalling Windows XP Before You BeginSpecifications Communications VideoAudio 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 Traveling With Your Computer Identifying Your ComputerPacking the Computer Travel TipsBack to Contents Troubleshooting Dell Technical Update ServiceDell Diagnostics When to Use the Dell DiagnosticsDell Diagnostics Main Menu Option FunctionDrive Problems Accessing the Dell Support UtilityDell Support Utility Clicking the Dell Support IconCD and DVD drive problems Hard drive problemsProblems writing to a CD/DVD-RW drive If you hear an unfamiliar scraping or grinding soundMail, Modem, and Internet Problems Error MessagesVerify that the modem is communicating with Windows Page Click Start→ Control Panel→ Add or Remove Programs Ieee 1394 Device Problems Keyboard ProblemsExternal Keyboard problems Lockups and Software Problems Unexpected charactersComputer does not start up Computer stops respondingMemory Problems Network ProblemsOther software problems Solid blue screen appearsPC Card or ExpressCard Problems Wireless Local Area Network WlanMobile Broadband Network Restart the computer and log on to the network againPower Problems Ensuring Sufficient Power for Your ComputerDocking Power Considerations Printer Problems Scanner ProblemsAC Power Loss While the Computer Is Docked Docking While the Computer Is RunningSound and Speaker Problems Touch Pad or Mouse ProblemsNo sound from headphones No sound from integrated speakersVideo and Display Problems If the display is blankIf the display is difficult to read Adjust the Windows display settings If only part of the display is readableClick Start→ Control Panel→ Appearance and Themes Connect an external monitor
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