Problem detailed here: http://forums.macrumors.com/showthread.php?t=1041336 I spent a long time with AppleCare, and they're shipping me a new one on Monday. I'm sending mine back. They said if the new one exhibits the behavior with two months that I can get a full refund with no restocking fees or anything regardless of whether or not I'm in the 90 day period (which sounds really cool...hoping they don't back out on that). I asked them if they were aware of the problem (this was a higher level manager....not the person who fields the calls), and he said "yes" and that it seemed to affect only the first production runs of the monitors....and my serial number fit within that range. I still think it's software (how could it not be?), but he's telling me that they haven't received a single complaint outside of a certain range of serial numbers, so "the new one they send should work". We'll see. I'll post back when updated.