Hello everyone - So, I have a 13" white MacBook that is about three years old. Recently, the Combo Drive stopped reading CD-Rs (possibly all discs in general, but I only ever use it to burn CDs, so I wouldn't have ever known), so I decided to try to install a new Super Drive myself. Following a guide on ifixit.com, I installed the new drive, but when I turned my computer back on, it was not recognizing the drive at all. System Profiler was saying "This system does not contain any ATA devices. If you have any ATA devices installed, please check that they are connected and powered on." I was then able to reinstall my old Combo Drive, which my computer recognized immediately. Thinking that I may have just not connected something tightly the first time, I tried a second time. Same thing happened. So, my question is, is there anything I may be missing or does this definitely mean the drive is defective? I just want to make sure I'm not sending back a functional drive before I go ahead and do so. Thanks!