I fitted a Panasonic DVR 106 to my Mac G4 533 but it declares my dvds (DVD-R, DVD-RW, DVD RAM) as locked and spits them out. I have tried it with OS 9.2.2 and OS 10.1. I get exactly the same result with a DVR 107 and I have no reason to believe that either drive is faulty. The drives are set as masters as was the CD drive that I replaced. I have a 100MB ZIP drive which means that the DVR is connected by means of an 80 way connector. Can anyone help?