I got this iBook a few days ago for my son, and it has been working fine until I decided to upgrade to OSX 10.4. For some reason it freezes during the install. I tried using the original Installation discs that came with the iBook and I get the same thing. STRANGE!!! I was told it was a bad RAM chip, but it only has the onbord chip so I had nothing to replace. Apple Hardware test passes with flying colors, I have reset the PMU to no avail....Kinda at a loss here. Oh, I have tried booting into Single User mode and installing that way as well...no dice. Any ideas or insight would be greatly appreciated. Thanks!