I joined specifically to start this thread, possibly get some answers. I bought OS X Leopard tonight and whenever I put it in the drive of my MBP, it just spits it back out. 15.4" 2.16ghz 2gb ram MBP, everything has worked perfectly except this. it accepts the disc, sits there, clicks a bit and spits it back out after about 15 seconds. It doesn't even load on the desktop. has this happened for anyone else? I tried resetting it how they described in another forum and still nothing. I even tried putting a DVD into it to see if my drive was shot, but it ran fine. Thanks.