34 Quick Reference Guidew w w . d e l l . c o m | s u p p o r t . d e l l . c o m 4 Click the System Restore tab.5 Ensure that Turn off System Restore is unchecked.Using the Last Known Good Configuration1 Restart your computer and press when the message Please select theoperating system to start appears.2 Highlight Last Known Good Configuration, press , press , and then select youroperating system when prompted.Other Options to Help Resolve Additional Device or Software ConflictsNOTICE: The following processes erase all of the information on your hard drive.• Reinstall your operating system using the operating system installation guide and OperatingSystem CD.During the operating system reinstallation, you can select to delete the existing partitions andreformat your hard drive.• Reinstall all drivers, beginning with the chipset, using the Drivers and Utilities CD.Dell DiagnosticsCAUTION: Before you begin any of the procedures in this section, follow the safety instructions in theProduct Information Guide.When to Use the Dell DiagnosticsIf you experience a problem with your computer, perform the checks in "Solving Problems" onpage 32 and run the Dell Diagnostics before you contact Dell for technical assistance.It is recommended that you print these procedures before you begin.NOTICE: The Dell Diagnostics works only on Dell™ computers. Using this program with other computerscan cause incorrect computer responses or result in error messages.The Dell Diagnostics allow you to:• Perform quick checks or extensive tests on one or all devices• Choose how many times a test is run• Display or print test results or save them in a file• Suspend testing if an error is detected or terminate testing if a certain number of errors occur• Access online Help screens that describe the tests and how to run them• Read status messages that tell you whether tests completed successfully• Receive error messages if problems are detected
