Hi all I'm in the process of trying ppc linux distros and am stuck getting open suse to install. I have verified the iso and burned at a slow speed. Holding down the c in the yaboot menu starts the disk but I can't install as it fails to see the dvd its reading from?

I understand I may be able to point open firmware at the disk but am not sure how to do this <strike>and dont want to borke my system </strike> i.e. would rather find a fix first
Any pointers or advice received with thanks.