Can you boot from the MacOSX install DVD now? If that does not work, it is highly unlikely that you will be able to boot from the MorphOS2.7 install CDROM.

If you can boot from the MacOSX Install DVD, then try burning another MorphOS2.7 CD-R from MacOSX if you have your G4 MacMini booting from the hard drive into MacOSX now. But, as I warned earlier, make sure you burn it correctly and do not just burn the contents of the ISO to a CD-R, which does not result in a bootable CD. You may also want to try a different brand of CD-R discs if your next attempt to burn the MorphOS2.7 install CD is not successful.

Good luck and don't give up. It is worth the effort to have MorphOS2.7 running on your G4 MacMini. You may want to look into installing Papiosaur's Pack Ultimate as well. It is a nice group of applications, games, emulators, backdrops and icons, with the dock setup for you.

There is no issue with the MorphOS2.7 ISO image and booting on the G4 MacMini, or it would have been fixed a long time ago.

[ Edited by amigadave 04.11.2011 - 04:50 ]