Hi. I am having problem with playing videos through itunes on the Macbook Air (I just got it today 1.6/80HD). I am playing normal res (640x400) mp4 videos and after a while (25 mins) it seems like a core shuts down. The CPU temp varies to like 59C-63C. The CPU's aren't necessarily that loaded but when it goes to 1 CPU, the single CPU gets pegged and everything stutters. The fan goes to about 6000 rpm. I'm charging the battery while playing so I'll try after it is fully charged but I am getting worried. I didn't realize that playing videos could cause a problem like this. I may have to eat the restocking fee 