I recently got myself a cheap second hand mac mini, only for watching movies on my TV, but the Mac OSX was pretty crap (10.3) and I can't upgrade to 10.5 because I only have a HD image, and I cant wipe the HD without the origional MacMini CD, which I don't have.

So I was just going to install Ubuntu onto it. I can't boot into OSX, no idea whats wrong.

Is there a way to boot into ubuntu setup from CD?