I've had trouble with my macbook. Every once in a while when i shut it down, when i close it the white light comes on in the front. It turned out that it was on one time when i didn't know and i put it in my case, it got pretty damn hot. Sometimes it takes a while for me to be able to turn it back on after I shut down and the light comes on. It also tells me that it has unexpectedly shut down when it finally boots up. But there was no unexpected shutdown that i've noticed. I talked to an apple store rep. and they said that it might be the logic board. Can a logic board be replaced in store? And also has anyone else had this problem?