Dell Precision M6400 Service Manual

Also see for Precision Workstation M6400: Manual How-to guide How-to guide System Board Replacement How-to guide

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Dell Precision M6400 Service Manual Manual pdf 2 page image

Troubleshooting: Dell Precision M6400 Service Manualfile:///T|/htdocs/systems/wsm6400/en/sm/trouble.htm[11/16/2012 10:26:15 AM]Back to Contents PageTroubleshootingDell Precision™ M6400 Service ManualTroubleshooting ToolsSolving ProblemsDell Technical Update ServiceTroubleshooting ToolsDiagnostic LightsCAUTION: Before working inside your computer, read the safety information that shipped with yourcomputer. For additional safety best practices information, see the Regulatory Compliance Homepage onwww.dell.com at: www.dell.com/regulatory_compliance.Your computer has three keyboard status lights located above the keyboard. During normal operation, the keyboard statuslights display the current status (on or off) of the Num Lock, Caps Lock, and Scroll Lock features. If the computer startswithout error, the lights flash, and then turn off. If the computer malfunctions, however, you can use the status of the lightsto help identify the problem.NOTE: After the computer completes POST, the Num Lock light may remain on, depending on your BIOS settings. Formore information on using the system setup program, see the Dell™ Technology Guide at support.dell.com.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 then Scroll Lock). If the computer malfunctions, the individual lights display a status of either On, Off , or Flashing .LightPatternProblemDescriptionSuggested ResolutionNo memorymodules aredetected.If two or more memory modules are installed, remove the modules (see Removing aMemory Module), then reinstall one module (see Replacing a Memory Module) andrestart the computer. If the computer starts normally, continue to install additionalmemory modules (one at a time) until you have identified a faulty module orreinstalled all modules without error.If available, install working memory of the same type into your computer (seeMemory).If the problem persists, contact Dell Support.Memorymodules aredetected, but amemory failurehas occurred.If two or more memory modules are installed, remove the modules (see Removing aMemory Module), then reinstall one module (see Replacing a Memory Module) andrestart the computer. If the computer starts normally, continue to install additionalmemory modules (one at a time) until you have identified a faulty module orreinstalled all modules without error.If available, install working memory of the same type into your computer (seeMemory).If the problem persists, contact Dell Support.Memory failedto initialize orIf two or more memory modules are installed, remove the modules (see Removing aMemory Module), then reinstall one module (see Replacing a Memory Module) and