I have a 4 mon old 2010 unibody macbook which i got in June of this yr new. Today it shut its self down while plugged in and it was kind of hard to get it started again,i had to push the power button 3 times before it finally booted and it took it a little bit to completely boot up,diagnostics said passed.and i kept getting the swirling beachball while i loaded firefox and itunes and iphoto. I seem to remember a few months ago that it shut down while plugged in and i remember it being really hot,i am not sure if that could have something to do with it or not. Does anyone know why it might of shut its self down like that? Any help would be appreciated as i am concerned about it.