Quick Reference Guide 33Diagnostic LightsCAUTION: Before you begin any of the procedures in this section, follow thesafety instructions in theProduct Information Guide.To help troubleshoot a problem, your computer has four lights labeled 1, 2, 3,and 4 on the front panel (see "Front View (Tower Orientation)" on page 11 or"Front View (Desktop Orientation)" on page 15). When the computer startsnormally, the lights flash, and then turn off. If the computer malfunctions,use the sequence of the lights to help identify the problem.NOTE: After the computer completes POST, all four lights turn off before booting tothe operating system.Diagnostic Light Codes During POSTLight Pattern Problem Description Suggested ResolutionThe computer is in anormal off conditionor a possible pre-BIOSfailure has occurred.Plug the computer into a workingelectrical outlet and press the powerbutton.A possible BIOSfailure has occurred;the computer is in therecovery mode.• Run the BIOS Recovery utility, waitfor recovery completion, and thenrestart the computer.• If the problem persists, contact Dell(see "Contacting Dell" in your User’sGuide).A possible processorfailure has occurred.• Reseat the processor (see "Processor"in your User’s Guide).• If the problem persists, contact Dell(see "Contacting Dell" in your User’sGuide).
