Dell Precision D490 Quick Reference Manual

Dell Precision D490 Quick Reference Manual Manual pdf 35 page image

Quick Reference Guide 35Error MessagesNOTE: If the message is not listed, see the documentation for either the operating system or the program that wasrunning when the message appeared.If an error occurs during start-up, a message may be displayed on the monitor identifying the problem. See"Error Messages" in the User’s Guide for suggestions on resolving any problems.Diagnostic LightsCAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the ProductInformation Guide.To help you troubleshoot a problem, your computer has four lights labeled "1," "2," "3," and "4" on the front.The lights can be "off" or green. When the computer starts normally, the lights flash. If the computermalfunctions, the pattern of the lights and also that of the power button help to identify the problem. Theselights also indicate sleep states.Diagnostic Light Codes Before POST4-4-3 Math-coprocessor test failure4-4-4 Cache test failureCode CauseDiagnostic Lights PowerLightProblem Description Suggested Resolutionoff No electrical power issupplied to the computer.Connect the computer to an electrical outlet.Ensure that the front-panel power light is on. Ifthe power light is off, ensure that the computeris connected to a working electrical outlet andthen press the power button.If the problem is still not resolved, contact Dellfor technical assistance.off The computer is in a normaloff condition; the computer isconnected to an electricaloutlet.Press the power button to turn the computeron.If the computer does not turn on, ensure thatthe front-panel power light is on. If the powerlight is off, ensure that the computer isconnected to a working electrical outlet andthen press the power button.If the problem is still not resolved, contact Dellfor technical assistance.