Why does my MacBook overheat?
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.
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