Dell OptiPlex 755 User Manual page 364

4 Restart the computer.
When the DELL logo appears, press <F12> immediately.
NOTE:
If you wait too long and the operating system logo appears, continue to wait until you see the
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Microsoft
NOTE:
The next steps change the boot sequence for one time only. On the next start-up, the computer boots
according to the devices specified in the system setup program.
5 When the boot device list appears, highlight CD/DVD/CD-RW Drive and press <Enter>.
6 Press any key to Boot from CD-ROM.
7 Follow the instructions on the screen to complete the installation.
364
Solving Problems
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Windows desktop; then, shut down your computer and try again.