Hi, I am working on a friends Macbook pro and I can't pinpoint what the problem is. It does not recognize the original hard drive when connected internally, but the the laptop Does recognize it and boots from it if I connect the same drive through my usb adapter. And my desktop sees it with the same adapter, so the drive is good. Now, to troubleshoot, I tried connecting another good drive internally and it sees that drive just fine and I can do anything with it. What might be the problem with the laptop? I would just switch drives, but the original drive is a 250 gig, whereas my spare is only 80.