Several years ago now, I created a DVD of all our old home made cine movies from years ago. I put hours of work in on this and designed all the jewel case and everything making it quite a neat job. I did all this using Sony Movie Studio on a Windows machine. Since then times have moved on somewhat and I now own an Apple iMac machine. The trouble is that now when ever I go to insert the DVD that I made into the iMac, firstly I get a loud burring sound which is like something running down, until it comes to a complete stop. Nothing happens except having the effect of jamming the whole of my mac up and the only thing I can then do is manually switch off and back on again, in the hope that then the DVD will be spat back out. Is this a codec problem or something else? Any help would be most appreciated indeed.