Hi, I'm having some trouble with opening up the DVD player that comes with mac. It gives me an error message saying that a valid video playback device could not be found. I'm using an Nvidia GeForce 6200. I'm not sure if that's a compatible card or not but it's been working for me quite well. My resolution is 1600 by 900 and the quality is great. I could even use iMovie 6 to edit some video footage. When I installed iMovie 8, however, it said that quartz extreme was not supported, but no big deal, I was satisfied with iMovie 6. If you guys know of anyway that I can get the mac to open the dvd player and play DVD's, please let me know. And if you know how to make iMovie 8 work, please tell me too.

Thanks a lot!