Question mark


I am having problems booting my PowerBook G3 with MacOSX Beta on it. Every once in a while, my computer displays a question mark onscreen. Other times, MacOS 9.0.4 boots, but after a long hesitation. I have tried installing MacOSX on an HFS+ partition of its own, on an UFS partition of its own, and on the entire hard-disk formatted in UFS mode, but to no avail: MacOSX works the first time, but does not reboot the second or third time, and is very fragile (for instance, copying files using the command line, from the Desktop to the root, while logged in as a user, causes MacOSX to crash.) I wonder if formatting my MacOSX partition did not mess up my hard disk.

Any help on this matter would be much appreciated.