So. following an ongoing issue with iMovie, I decided to upgrade to 10.4.7 in the vein hope that it might fix my problem (see here), instead I have a new raft of issues - the most obvious being that my optical drive is no longer accepting media. It just feels 'locked' - as if there is already a disc in there (which there isn't). Anyone experince this? know of a fix? I have to say, after 5 year happy motoring with Apple machines, I've never been more frustrated than I am, right now, with my MBP.