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28 Quick Reference Guide
www.dell.com | support.dell.com
Using Last Known Good Configuration
1
Restart your computer and press <F8> when the message
Please select the
operating system to start
appears.
2
Highlight Last Known Good Setting, press <Enter>, press <l>, and then select
your operating system when prompted.
Other Options to Help Resolve Additional Device or Software Conflicts
NOTICE: The following processes erase all of the information on your hard drive.
• Reinstall your operating system using the operating system installation guide and operating
system CD.
During the operating system reinstallation, you can select to delete the existing partitions
and reformat your hard drive.
• Reinstall all drivers, beginning with the chipset, using the
Drivers and Utilities
CD
.
Dell Diagnostics
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions
located in the Product Information Guide.
When to Use the Dell Diagnostics
If you experience a problem with your computer, perform the checks in "Solving Problems"
on page 25 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 computers
can 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