I disassembled and reassembled it with a new 250gig hard drive. Currently everything works except the hard drive, as I can boot it up, load the OSX cd and get to the utilities and install screen. The problem is that when I go to either of those screens it doesn't show the hard drive as being there. Any hints as to what I have done wrong and possible fixes would be greatly appreciated. If you need more information to help I will try to give it to you, but I can't think of anything else right now that is pertinent. EDIT: Its a G4.