ok, i have a bootable dvd, and i know that it works fine on an internal dvd drive because i tried it on another computer with an internal dvd drive and it booted fine. well, my pc doesnt have an internal dvd drive, but i have an external usb dvd drive. i cannot boot from it. in the bios, i have tried setting it to boot from cd and removable devices and neither work. is there even a way to boot from an external dvd drive?