I bought a PB G4 1.33 on ebay. It was listed "as-is" because it was suffering from kernel panics. First it would lock up, then it started with kernel panics. I tried booting from a Leopard DVD and it locked up. Well, years ago I sent in an PB G4 for warranty repairs and it was returned with a burned AHT CD in the drive. Turns out it is version 2.5 and it works on this machine. I ran it and it passed all tests. This thing has been running for hours with no problems. Could it be a failing HD even though it passed the Apple Module Test OF?