I just happened to look at the "About This Mac" thing this morning and noticed that it's only recognizing 5 of the 6GB of RAM I have installed. Did one of the DIMMs die or something? I shutdown my Mac Pro and checked to make sure everything was installed properly. Booted up again and still only 5GB. I'm guessing it has to be the Apple memory because the two sticks I installed were both 2GB. Is this something Applecare would cover?