I have 2 G4/400's, and one of them will not allow me to install OS10.2. If I try to use the install disks, it freezes right at the beginning of launching the cd. No matter what I try (extensions off, replacing ram...), it freezes. I even went so far as to pull the harddrive, put it in the other G4, install the OS on it, and then put it back in the original G4. Turn on the computer...same freeze. The only remaining culprit would appear to be the motherboard. Anyone have any ideas of where to start?