Boot from External DVD Drive

[cardude2004]

I have an external USB drive that reads DVD's that I would like to boot from. I can't seem to find boot from USB in the BIOS. I am looking for a floppy or CD image that I can boot with that will run my dvd drive.

 

[Casio]

You may need a BIOS upgrade, not all BIOS support booting off a USB device. How old is your PC?