Hi there again guys, I've been trying to play this DVD I bought a few weeks ago but every time I put it in the drive spits it out. Furthermore, when I open Disk Utility or System Profiler after an attempt, all trace of an optical disc drive has vanished. I've tried many other discs since to see if it was a drive problem but they work fine including the other disc in the same set (it was a 2-disc box set). To test whether it was a disc problem, I tried it in a DVD player and it plays fine. Does anyone know where the fault may lie?