Dell MTC2, G7279, DMC 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 39). 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 located 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	into a working electrical outlet and
	failure has occurred.	that you have pressed the power
A B C D		button.
A B C D

= yellow
= green
= off

Advanced Troubleshooting

39

Image 39

Contents W . d e l l . c o m s u p p o r t . d e l l . c o m Abbreviations and Acronyms Contents Program is designed for an earlier Microsoft Windows Mail, Modem, and Internet ProblemsAdding or Replacing a Second Hard Drive Advanced TroubleshootingUsing Microsoft Windows XP System Restore Resolving Software and Hardware IncompatibilitiesAppendix 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 Finding Information for Your ComputerTechnical support Downloads Drivers, patches, and software updatesSupport questions Online coursesPrinter Cable Setting Up a PrinterConnecting a Parallel Printer Setting Up and Using Your ComputerConnecting a USB Printer Parallel connector on computerScrews Clips Parallel printer Cable Notches Setting Up a Home and Office Network Connecting to a Network AdapterUSB connector on computer Network wall jack Network cable Connecting to the InternetNetwork Setup Wizard Click Checklist for creating a networkSetting Up Your Internet Connection Click Connect to the InternetIf you have a CD, click Use the CD I got from an ISP Click Exact Copy How to Copy a CD or DVDUsing Blank CD-Rs and CD-RWs Copying CDs and DVDsHyper-Threading Helpful TipsClick Hardware and click Device Manager Booting to a USB Device Turning Off Your ComputerTurn Off Computer Turn off computer window, click Turn off 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 ProblemsDrive Problems Floppy drive problemsBack of floppy disk Write-protected Not write- protected CD drive problemsDVD drive problems Problems writing to a CD-RW driveHard drive problems Mail, Modem, and Internet ProblemsError Messages Computer stops responding General ProblemsSolid blue screen appears Other software problemsProgram stops responding Program crashes repeatedlyGeneral hardware problems Other technical problemsIeee 1394 Device Problems Mouse Problems Keyboard ProblemsNetwork Problems Power Problems Network integritySpeed light Printer Problems Scanner Problems No sound from speakers Sound and Speaker Problems Video and Monitor Problems No sound from headphones If the screen is blank If the screen is difficult to read Solving Problems Diagnostic Lights Light Pattern Problem Description Suggested ResolutionAdvanced Troubleshooting If the problem persists, contact Identified a faulty module orError If available, install properlyConnector or reinstalled all If the problem persists orDifferent connector and restart You have identified a faultyRequirements see Connector placementThat you are installing are Memory module/memoryStarting the Dell Diagnostics Dell DiagnosticsDell Diagnostics Main Menu Option FunctionTab Function Identifying Drivers What Is a Driver?Reinstalling Drivers DriversClick Roll Back Driver Using Windows XP Device Driver RollbackManually Reinstalling Drivers Restoring Your Operating SystemRestoring the Computer to an Earlier Operating State Using Microsoft Windows XP System RestoreCreating a Restore Point Click System RestoreUsing Dell PC Restore by Symantec Click Performance and Maintenance and click System Enabling System RestoreClick Performance and Maintenance Click the System Restore tabAdvanced Troubleshooting Front and Back View of the Computer Front ViewOn computers with an optional floppy drive Adding Parts Computer. Instead, perform an operating system shutdown Back View Network jack Guide Removing the Computer CoverComputer cover Cover latch Back of computer Looking Inside Your Computer System Board Securing screw Filler bracket Adding CardsCard Card cutout CrossbarNot fully seated card Fully seated card Bracket Adding or Replacing the AGP Card AGP card Card clip lever Slot connector Installing an AGP CardNotch Lever Tab Card clip AGP connector PCI connectorAdding or Replacing a Second Hard Drive Existing hard drive ScrewsDrive bracket Drive bracket Adding a Floppy Drive Side hinges Front panel Top tab Middle tabBottom tab Tabs Insert Top bracket screw Drive bracket Floppy drive Side hinges Front panel Adding a Second CD or DVD Drive Bottom tab Adding Parts Drive Alignment screws Insert TabsDrive Securing screw Side hinges Front panel Memory Installation Guidelines Adding MemoryDDR Memory Overview Installing Memory Notch Securing clips ConnectorReplacing the Computer Cover Appendix SpecificationsSystem Information Expansion BusDrives Ports and ConnectorsMemory Other factorsNetwork PowerVideo AudioSystem Setup OverviewEnvironmental Viewing Settings System Setup ScreensKeys Action Boot Sequence Option SettingsChanging Boot Sequence for the Current Boot Changing Boot Sequence for Future Boots Clearing Forgotten PasswordsReplacing the Battery Battery Battery socket Definition of Third-Party Software and Peripherals Definition of Dell-Installed Software and PeripheralsDell Technical Support Policy U.S. Only FCC Notices U.S. OnlyClass a Class B FCC Identification Information Contacting DellAppendix Appendix Appendix Appendix Appendix Appendix Appendix Area Codes Local Numbers, Toll-Free Numbers Appendix 100 101 102 103 104 105 106 Index 107 IndexIndex Help files accessing, 9 Compatibility, 27 restore to previous operating108 Index Wizard, 27 reinstalling, 47 scanner, 34 System Restore Wizards Program Compatibility WizardIndex 109 Index 110