Old Cube Feild My Fiance' Just Got An Old PowerMac G4 Cube, How Do I Install Osx On It? Or Can I Erase It And Start Over?

My fiance' just got an old PowerMac G4 Cube, how do I install osx on it? Or can I erase it and start over? - old cube feild

The cube can have up to OS 10.4.11 () Tiger, then you take a Tiger install disc and it must be somewhere.

During the installation you will be prompted to erase and install or update and install it.