If one buy an OSX set separate, it will work everywhere. Otherwise the disks that came with the Mac will only work on such a Mac. Paul Moortgat On 04 Jan 2009, at 14:09, Ken Johnson wrote: > I have the disks that originally came with my MacBook-Pro (10.5.X), > that I tried to use in my Mac-Mini. Looked like it would work, but > at the last minute did not. I'm certain that I've seen a way around > this problem, but can't find it - any ideas?