I have a Mac Mini G4 and a Leopard install DVD. For some reason, my Mac Mini won't read the DVD in the internal drive so I can't boot from it. I also have an external USB drive. I would like to boot from the external drive. Is this possible? If so, how?

Thanks

p.s. I've tried holding down the 'c' key during boot up but that doesn't work. :-/

EDIT: I googled the question and found the answer: can't boot from USB.