Kesa,
I've had an issue like thison my Mac Mini. I couldn't get it to boot from the ISO disk and thus couldn't install Morphos. There was nothing apparently wrong with the hardware or the ISO disk. I even had a couple of email exchanges with the guy who sold me the Mini on ebay and he said the machine had always worked fine for him.
Nonetheless, I fixed the problem by replacing the drive. I had a spare from another dead Mac Mini.
