Likewise, I've ust purchased a Mac Mini (1.42GHz) and had quite a chore to install MorphOS 3.11.
I've even managed to mess up OS X to find that my install DVD is corrupted.
For some reason, even though I had partitioned and correctly formatted the HD following instructions I had downloaded for dual booting, I just couldn't get MOS to install.
Eventually, I gave up and let the automatic install routine do its stuff.
I don't really miss OS X that much anyway, so now I have a lovely new MOS 3.11 install working perfectly.
Next job is to convince her indoors that I absolutely do need to shell out the registration fee!
Amiga 500, A600 (x2), A1200 (x2), CDTV, AmigaOne XE G4 with AOS4.1, PC with AmigaForever2010, Netbook with AmigaForever2011 and AROS, PowerMac G4 with OSX 10.4.11 and MorphOS, Mac Mini G4 with 10.5 and MorphOS