Dell H7228 manual Diagnostic Lights, Light Pattern Problem Description Suggested Resolution

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Advanced Troubleshooting

Diagnostic Lights

To help you troubleshoot a problem, your computer is equipped with four lights on the back panel labeled "A," "B," "C," and "D" (see page 57). These lights can be yellow or green. When the computer starts normally, the lights flash. After the computer starts, the lights remain green. If the computer malfunctions, the color and sequence of the lights identify the problem.

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

Light Pattern	Problem Description	Suggested Resolution

	The computer is in a normal off	Verify that the computer is plugged
	condition or a possible pre-BIOS failure	into a working electrical outlet and
	has occurred.	that you have pressed the
A B C D		power button.

= yellow

= green

= off

Advanced Troubleshooting

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Contents USB 2.0 connectors Ieee 1394 connector Dell Dimension 4600CAbbreviations and Acronyms Contents Program is designed for an earlier Microsoft Windows Mail, Modem, and Internet ProblemsResolving Software and Hardware Incompatibilities Using Microsoft Windows XP System RestoreAppendix Safety Instructions Safety InstructionsW . d e l l . c o m s u p p o r t . d e l l . c o m Microsoft Windows License Label Tips on using WindowsHow to clean my computer Finding Information for Your ComputerSupport questions Answers to technical serviceDownloads Drivers, patches, and software updates How to use Windows XPSetting Up and Using Your Computer Connecting the AC Adapter Japan onlyAttaching and Removing the Computer Stand Tabs Tab holes Setting Up and Using Your ComputerScrew Setting Up a Printer Screws Clips Parallel printer Cable Notches Connecting a Parallel PrinterParallel connector on computer Printer CableUSB connector on computer Connecting a USB PrinterIeee 1394 connector Ieee 1394 cable Connecting an Ieee 1394 Device OptionalSetting Up a Home and Office Network Connecting to a Network AdapterNetwork cable Network Setup WizardSetting Up Your Internet Connection Connecting to the InternetCopying CDs and DVDs How to Copy a CD or DVDHyper-Threading Using Blank CD-Rs and CD-RWsHelpful Tips Turning Off Your Computer Booting to a USB DeviceSetting Up and Using Your Computer Solving Problems Finding SolutionsW . d e l l . c o m s u p p o r t . d e l l . c o m See Finding Help Information Battery ProblemsCD drive problems Drive ProblemsProblems writing to a CD-RW drive DVD drive problems Mail, Modem, and Internet ProblemsHard drive problems Solving Problems Operating System not Found Contact Dell see Error MessagesProgram crashes repeatedly General ProblemsComputer stops responding Program stops respondingSolid blue screen appears Other software problemsGeneral hardware problems Other technical problemsKeyboard Problems Ieee 1394 Device ProblemsMouse Problems PC Card Problems Network ProblemsLink activity light Power Problems Printer Problems Scanner Problems No sound from speakers Sound and Speaker Problems No sound from headphones Video and Monitor Problems If the screen is blank If the screen is difficult to read Solving Problems Light Pattern Problem Description Suggested Resolution Diagnostic LightsAdvanced Troubleshooting Identified a faulty module or Modules installed, removeModules, reinstall one module Normally, reinstall an additionalSee page 66, and restart Remove the card and reinstall itIf the problem persists or If the computer has a video cardDell Diagnostics Option Function Starting the Dell DiagnosticsTab Function What Is a Driver?Drivers Identifying DriversRestoring Your Operating System Reinstalling DriversRestoring the Computer to an Earlier Operating State Using Microsoft Windows XP System RestoreUsing Dell PC Restore by Symantec Resolving Software and Hardware Incompatibilities Enabling System RestoreFront View Front and Back View of the ComputerAdding Parts More information Unexpectedly restartInstead, perform an operating system shutdown Back View Network jack Modem jack Reattaching the Front Door Hinge arms Closed position Opening the Computer CoverFront door Back of computer Adding Parts Cable security tabLooking Inside Your Computer System Board PC Card Types Adding PC Cards OptionalInstalling a PC Card Removing a PC Card Adding Other Cards Adding or Replacing a Video Card Removing a Video Card Notch Lever Tab card clip AGP connector PCI connectorHinged lever Filler bracket Adding Memory Installing a Video CardDDR Memory Overview Installing Memory Notch Memory module Cutouts Crossbar Securing clips ConnectorRemoving Memory Closing the Computer Cover Expansion Bus SpecificationsMicroprocessor System InformationVideo Ports and ConnectorsMemory DrivesControls and Lights PowerAudio NetworkIs 914 m 3000 ft Environmental914 m 3000 ft Standard Settings Viewing Settings Clearing Forgotten PasswordsSystem Setup Screens Replacing the Battery Battery Dell Technical Support Policy U.S. Only Definition of Dell-Installed Software and PeripheralsDefinition of Third-Party Software and Peripherals Class a Class B FCC Notices U.S. OnlyFCC Identification Information Contacting DellAppendix Appendix Appendix Appendix Area Codes Local Numbers, Toll-Free Numbers Appendix Area Codes Local Numbers, Toll-Free Numbers Appendix Appendix Appendix Appendix 800 300 412 or 21 422 07 Appendix Appendix Toll-free Or toll-free Appendix Index 101 Index102 Index IndexIndex 103 Index 104