54Using Support ToolsDell DiagnosticsIf you experience a problem with yourcomputer, perform the checks in “Lockups andSoftware Problems” on page 48 and run theDell Diagnostics before you contact Dell fortechnical assistance.NOTE: Dell Diagnostics works only on Dellcomputers.NOTE: TheDrivers and Utilities disc maynot ship with your computer.See the Comprehensive Specifications atsupport.dell.com/manuals to review yourcomputer’s configuration information, andensure that the device that you want to testappears in the system setup program andis active.Start the Dell Diagnostics from your hard driveor from theDrivers and Utilities disc.Starting Dell Diagnostics From YourHard DriveThe Dell Diagnostics is located on a hiddendiagnostic utility partition on your hard drive.NOTE: If your computer cannot displaya screen image, contact Dell (see“Contacting Dell” on page 72).Ensure that the computer is connected to an1.electrical outlet that is known to be workingproperly.Turn on (or restart) your computer.2.When the DELL3. ™ logo appears, press immediately. Select Diagnostics from theboot menu and press .This may invoke the Pre-Boot SystemAssessment (PSA) on your computer.NOTE: If you wait too long and the operatingsystem logo appears, continue to wait untilyou see the Microsoft® Windows® desktop,then shut down your computer and try again.