I have a mac mini which I have OS X on. The OS was loaded as a netinstall image. It all works fine.

I have connected an external firerwire hard drive which I want to install another copy of the OS onto.

I insert the OS X install disk and start of a new installation. It then requests that I reboot the machine.

After rebooting the grey apple logo appears, but after a couple of seconds it kind of jumps to the right slightly and then two black marks appear next to it.

It isnt the disk as I got a copy off a collegue and that one does the same.

Any ideas?

Ed