Why does my MacBook overheat?
My 2007 MacBook Pro seems to abruptly overheat, even when I’m not doing anything intensive. I can be watching a video for a couple of hours with the fans whirring silently and then, after I quit, the fans will spring into life and blast away at full speed, staying at this level until I shut down. Other times, my MacBook runs the fans at full speed even from startup… help! Brian Halliday If the air coming out of the vent feels cool, this might be a problem with the fan regulator rather than overheating. If your Mac isn’t running hot during video playback then it isn’t likely to suddenly heat up just because you’ve closed the video. OS X doesn’t run the fan slower than it needs to. It is, however, common for fans to get stuck at maximum speed; it’s nearly always fixed by resetting the System Management Controller (SMC). On the 2007 MacBook Pro, which has a removable battery, the procedure is to shut down the Mac, disconnect the MagSafe connector, take out the battery and hold the power button down for five seconds. Then put the battery and MagSafe connector back in and restart.