Since Late 2009, there’s been a well-documented issue with the iMac line. If you upgrade the hard drive, the fans can start spinning like crazy. The fans at high speed are loud, mainly unnecessary, and have caused a lot of headaches for DIYers everywhere.

The reason the fans spin this way has to do with the iMac’s method of hard drive temperature sensing. Prior to 2009, sensors were placed outside the hard drive to gauge how warm the drives were – if they got too hot, the fans turned on to keep everything nice and cool. This method was simple, effective and made changing, exchanging, or upgrading the main hard drive a relatively simple task.

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