Dell Precision M2400 Service Manual

Also see for Latitude E6400 ATG: Manual How-to guide How-to guide System Board Replacement How-to guide

Contents

Dell Precision M2400 Service Manual Manual pdf 84 page image

Back to Contents PageTroubleshootingDell™ Latitude™ E6400 and E6400 ATG andMobile Workstation Precision™ M2400 Service ManualTroubleshooting ToolsSolving ProblemsDell Technical Update ServiceDell Support UtilityTroubleshooting ToolsDiagnostic LightsYour computer has three keyboard status lights located above the keyboard. During normal operation, the keyboard status lights display the current status(on or off) of the Num Lock, Caps Lock, and Scroll Lock features. If the computer starts without error, the lights flash, and then turn off. If the computermalfunctions, however, you can use the status of the lights to help identify the problem.Diagnostic Light Codes During POSTTo troubleshoot a problem with your computer, read the sequence of the keyboard status lights in order from left to right (Num Lock, Caps Lock, and thenScroll Lock). If the computer malfunctions, the individual lights display a status of either On , Off , or Flashing .CAUTION: Before you begin any of the procedures in this section, follow the safety instructions that shipped with your computer.NOTE: After the computer completes POST, the Num Lock light may remain on, depending on your BIOS settings. For more information on using thesystem setup program, see the Dell™ Technology Guide on your computer or at support.dell.com.LightPatternProblem Description Suggested ResolutionNo memory modules aredetected.l If two or more memory modules are installed, remove the modules (see Removing a Memory Module),then reinstall one module (see Replacing a Memory Module) and restart the computer. If the computerstarts normally, continue to install additional memory modules (one at a time) until you have identified afaulty module or reinstalled all modules without error.l If available, install working memory of the same type into your computer (see Memory).l If the problem persists, contact Dell Support.Memory modules aredetected, but a memoryfailure has occurred.l If two or more memory modules are installed, remove the modules (see Removing a Memory Module),then reinstall one module (see Replacing a Memory Module) and restart the computer. If the computerstarts normally, continue to install additional memory modules (one at a time) until you have identified afaulty module or reinstalled all modules without error.l If available, install working memory of the same type into your computer (see Memory).l If the problem persists, contact Dell Support.Memory failed to initialize ormemory is unsupported.l If two or more memory modules are installed, remove the modules (see Removing a Memory Module),then reinstall one module (see Replacing a Memory Module) and restart the computer. If the computerstarts normally, continue to install additional memory modules (one at a time) until you have identified afaulty module or reinstalled all modules without error.l If available, install working memory of the same type into your computer (see Memory).l If the problem persists, contact Dell Support.System board failure hasoccurred.l Contact Dell Support.A possible processor failurehas occurred.l Reseat the processor (see Processor Module).l If the problem persists, contact Dell Support.A possible graphicscard/video failure hasoccurred.l Reseat any installed graphics cards.l If available, install a working graphics card into your computer.l If the problem persists, contact Dell Support.A possible LCD failure hasoccurred.l Reseat the LCD cable (see Display Assembly).l If the problem persists, contact Dell Support.System failed on hard driveinitialization.l Reseat the hard drive (see Hard Drive).l If the problem persists, contact Dell Support.