40Using Support ToolsDell DiagnosticsIf you experience a problem with yourcomputer, perform the checks in “Lockups andSoftware Problems” on page 33 and run theDell Diagnostics before you contact Dell fortechnical assistance.It is recommended that you print theseprocedures before you begin.NOTE: Dell Diagnostics works only onDell computers.NOTE: TheDrivers and Utilities discis optional and may not ship with yourcomputer.See the System Setup section in the ServiceManual to review your computer’s configurationinformation, and ensure that the device thatyou want to test displays in the system setupprogram and is 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 57).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.