Dell OptiPlex 960 (Late 2008) - Manual (Page 144)

3. When the DELL™ logo appears, press <F12> immediately. Select Diagnostics from the start menu and press <Enter>.
4. Press any key to start the Dell Diagnostics from the diagnostics utility partition on your hard drive, and follow the instructions on the screen.
Starting the Dell Diagnostics From the Dell Drivers and Utilities Media
1. Insert the Drivers and Utilities media.
2. Shut down and restart the computer.
When the DELL logo appears, press <F12> immediately.
3. When the boot device list appears, highlight CD/DVD/CD-RW and press <Enter>.
4. Select the Boot from CD-ROM option from the menu that appears and press <Enter>.
5. Type 1 to start the CD menu and press <Enter> to proceed.
6. Select Run the 32 Bit Dell Diagnostics from the numbered list. If multiple versions are listed, select the version that is appropriate for your computer.
7. When the Dell Diagnostics Main Menu appears, select the test that you want to run, and follow the instructions on the screen.
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NOTE: If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft® Windows® desktop, and then
shut down your computer and try again.
NOTE: If you see a message stating that no diagnostics utility partition has been found, run the Dell Diagnostics from the Drivers and Utilities
media.
NOTE: The Dell Drivers and Utilities media is optional and may not ship with your computer.
NOTE: If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft® Windows® desktop; then, shut
down your computer and try again.
NOTE: The next steps change the boot sequence for one time only. On the next start-up, the computer starts according to the devices specified in
the system setup program.