Dell Precision 490 Desktop User Manual

Also see for Precision Workstation 490: Quick reference guide Quick reference guide Quick guide Specifications

Contents

Back to Contents PageTools to Help Solve ProblemsDell Precision™ Workstation 490 User's GuideDiagnostic LightsBeep CodesError MessagesDell DiagnosticsDriversRestoring Your Operating SystemSoftware and Hardware IncompatibilitiesDiagnostic LightsTo 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 thecomputer starts normally, the lights flash. If the computer malfunctions, the pattern of the lights and also that of the power button help to identify theproblem. These lights also indicate sleep states.Diagnostic Light Codes Before POSTCAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.DiagnosticLightsPowerLightProblem Description Suggested Resolutionoff No electrical power is supplied to thecomputer.Connect the computer to an electrical outlet. Ensure that the front-panel powerlight is on. If the power light is off, ensure that the computer is connected to aworking electrical outlet and then press the power button.If the problem is still not resolved, contact Dell for technical assistance (seeContacting Dell).off The computer is in a normal off condition;the computer is connected to an electricaloutlet.Press the power button to turn the computer on.If the computer does not turn on, ensure that the front-panel power light is on.If the power light is off, ensure that the computer is connected to a workingelectrical outlet and then press the power button.If the problem is still not resolved, contact Dell for technical assistance (seeContacting Dell).blinkinggreenThe computer is in a reduced power or"sleep" state.Use one of the appropriate methods to "wake up" the computer. See AdvancedFeatures.If the problem is not resolved and you are trying to wake the computer with aUSB mouse or keyboard, substitute the mouse or keyboard with a working PS/2mouse or keyboard and then try to wake the computer.blinkinggreenThe computer is in a reduced power or"sleep" state.Use one of the appropriate methods to "wake up" the computer. See AdvancedFeatures.If the problem is not resolved and you are trying to wake the computer with aUSB mouse or keyboard, substitute the mouse or keyboard with a working PS/2mouse or keyboard and then try to wake the computer.(blinking)amber The BIOS is not executing. Ensure that the processor is seated correctly and restart the computer (seeProcessor).If the problem is still not resolved, contact Dell for technical assistance (seeContacting Dell).(blinking)blinkingamberA possible power supply or power cablefailure has occurred.Perform the procedure in Power Problems.If the problem is still not resolved, contact Dell for technical assistance (seeContacting Dell).(blinking)amber A possible system board failure hasoccurred.Contact Dell for technical assistance (see Contacting Dell).(blinking) amber A processor mismatch exists. See Troubleshooting Tips, then refer to Memory Problems and Power Problems.