My MacMini G4 1.5 is set up to dualboot with OSX/MorphOS. I havent been using OSX on it for a while, but today it hung at the apple startup screen for an half hour before I decided to turn it off. Now when trying to boot MacOS it just turns itself off shortly after the apple boot screen spinner shows.
Is there a way to fix this without reinstalling, like a safe boot option or perhaps something I can do with the MacOS drive from MorphOS?
I read that safe mode is entered by holding the shift key during startup, but then it will boot MorphOS, being set as default here.

Or maybe I just will use this problem as a chance to get more space for MorphOS, and format the Mac partition as a new work drive for MorphOS.
My system drive was getting quite full anyway.