I'm pretty sure the fault lies with the firmware. I can't even boot using the original OS X install disc. It just gets spat out too.

Booted with ALT held down (Option on a Mac) to get the graphical boot menu. I insert either the OS X disc or the MorphOS disc and after 10 - 20 seconds, or a refresh (hitting SPACE) the icons show up. However, I am unable to change the selection from the HDD. The cursor keys do nothing and I am unable to select anything with the mouse.

I need to see if this can be flashed to a later version. I've never had dealings with Mac firmware before so will need to do some digging around.

On the plus side, I have 3 discs with MorphOS install on them

Pete.