While I excitedly await the arrival of my new i7 quad I'm also a little bit worried about this issue with screen flickering/tearing/going black that a lot of users of the new iMac seem to be complaining about. I don't know if the quad-core models with the 4850 card may not have this problem or if the 10.6.2 update addressed any of these problems but it's making me a little bit anxious as I await arrival. Anyone got anything to report?