I just replaced my recently purchased 5900U with a new 9800XT - I was curious if there would be a noticable difference. I installed the latest drivers from ATI (3.10) and now my computer crashes to a blank screen while in FB but not while actually flying. (I left my computer with FB running - on main screen - to take care of a few things and found it crashed when I returned about an hour later. Repeated the process to test it and, sure enough, it crashed to a blank screen after an hour or so. I've checked all screen savers, power savers, etc and they are not turned on. I can post my DXDIAG, but don't want to waste anyone's time if this is a known problem. I know it isn't heat, although that came to mind. System temp is steady at 38 C. Any thoughts would be much appreciated.