All right, I'm using a Macbook that I've had since October. I recently bought the port of Halo for OSX, and I installed it with no problem, and I've played it since then. Occasionally, though, when I'd insert the CD, it would whirr a bit and then eject without registering in the disk utility. Similarly, sometimes, after it HAD recognised the CD, and I'd manually eject it, the icon for the CD would remain on the desktop. Now it's taken to ejecting every time I insert it. I've tried restarted/switching off and on to no avail, and every other CD and DVD I have works fine. Any suggestions?