Vaio will not boot from CD

[abottig]

Vaio laptop.

Internal Optical Drive is set as the first boot device in BIOS. CD Drive accepts discs, and you can hear it spin up... I've tried booting from Vista CD and UBCD. No luck.

The screen does not display "Press any key to boot from CD..."

Very strange. Any ideas?

EDIT:
I have also excluded all other devices from booting. I am left with a message reading "Operating System not found."

 

[Greek7]

Put an USB DVD-ROM and insert your prefered OS Disk Go.Press Power button ,Then go to Bios-with F2 on startup- and in Boot order make disable all-By press X for all device- save all and exit-or press F10.