Dell OptiPlex DC01T Setup And Quick Reference Manual page 22

3 Shut down and restart the computer.
When the DELL logo appears, press <F12> immediately.
NOTE:
to wait until you see the Microsoft Windows desktop; then, shut down your
computer and try again.
NOTE:
next start up, the computer starts according to the devices specified in the
system setup program.
4 When the boot device list appears, highlight CD/DVD/CD-RW and press
<Enter>.
5 Select Boot from CD-ROM from the menu that appears and press
<Enter>.
6 Type 1 to start the CD menu and press <Enter> to proceed.
7 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.
8 When the Dell Diagnostics Main Menu appears, select the test that you
want to run, and follow the instructions on the screen.
22
Troubleshooting Tips
If you wait too long and the operating system logo appears, continue
The next steps change the boot sequence for one time only. On the