Well my last thought then is (if you by no means can get into the promt (F8)) that the kernel
doesn't like someting. A far as I know it's Voodoo as a default. The only thing you then can do is fool around with some bios settings and hope that is the solution.

If you can get into the promt lots more can be done.

Grub or the bootloader are no issue cos your not booting of your harddrive.
If the DVD is ok the kernel is next.

(Actually the kernel is NeXT but that's a insider joke)