I'm running a PowerBook G4 and I have recently run into some problems with kernel panic. I have bought and installed new ram, zapped the pram, and re-written the hard drive and I still have problems. The weird thing is, the computer only crashes when I move it. If I just sit still then it works fine, but if I move it from my lap to a table or something like that then I get the restart message. I have an appointment with the Geek bar tomorrow but they probably won't be any help. Any suggestions?