Quick Reference Guide 51If computer problems occur that require help from Dell, write a detaileddescription of the error, beep codes, or diagnostics light patterns, record yourExpress Service Code and Service Tag below, and then contact Dell from thesame location as your computer. For information on contacting Dell, see youronline User’s Guide.For an example of the Express Service Code and Service Tag, see "FindingInformation" on page 5.Express Service Code:___________________________Service Tag:___________________________Dell DiagnosticsCAUTION: Before you begin any of the procedures in this section, follow thesafety instructions in the Product Information Guide.When to Use the Dell DiagnosticsIf you experience a problem with your computer, perform the checks in"Solving Problems" in your online User’s Guide and run the Dell Diagnosticsbefore you contact Dell for technical assistance. For information oncontacting Dell, see your online User’s Guide.NOTICE: The Dell Diagnostics works only on Dell™ computers.Enter system setup (see "System Setup Program" in your online User’s Guidefor instructions), review your computer’s configuration information, andensure that the device you want to test displays in system setup and is active.Start the Dell Diagnostics from either your hard drive or from the optionalDrivers and Utilities media.Starting the Dell Diagnostics From Your Hard DriveThe Dell Diagnostics is located on a hidden diagnostic utility partition onyour hard drive.NOTE: If your computer cannot display a screen image, contact Dell (see youronline User’s Guide).1 Shut down the computer. Turn on (or restart) your computer.2 When the DELL™ logo appears, press immediately.