haha this keeps happening to me so posting here so i can find the solution easier when i need it ^_^

System Management Controller (SMC), responsible forcontrolling the fans, has become confused

on left hand side of the keyboard press Control-Shift-Option and on the top right of the keyboard, the power key at the same time. press power to turn laptop back on

https://discussions.apple.com/thread/3856779?start=0&tstart=0