I picked up a TiBook G4 locally earlier today. It has a 40gb HDD(I think original) that as best as I can tell is fine. I pulled it out, and was able to read/write/access it just fine via a USB HDD controller. In fact, I even cloned a good Tiger install onto it. I can find no evidence, however, that the computer is recognizing the HDD. I currently have the computer running via a USB HDD drive with a good Leopard install(it's slooooow over USB 1.1) and the only ATA bus that the system recognizes in system profile is the one on which the optical drive is installed. The mounting hardware is missing for the hard drive, and I've ordered a mounting bracket kit that includes a new ribbon cable. I can't help but think that there might be more wrong than just a bad cable, though. Any thoughts about where I should look for problems-or more specifically to rule out a bad logic board?