I have a chance to buy a QuickSilver PowerMac for $140 because it's having a kernel panic at least once a day and the current owner doesn't want to bother fixing it. He said he reformatted the drive and reinstalled OS 10.4, but it didn't fix it. He said disk utility doesn't report an error. He's selling it as is with no refund, so I wouldn't want to buy it unless I could be certain I could fix the problem. He said I can play with it for as long as I like before buying it. Any ideas what could be wrong with it? I'm especially interested in problems that I can identify by inspection that I could be almost certain is the problem causing the kernel panics.