![]() ![]() If your fans are each in the 1,000rpm range (give or take a couple hundred) everything is running normally. If the hard drive fan is spinning over 2,000rpm, chances are the cable isn’t fully seated at one end or the other (or you’ve installed a Western Digital drive – see the next section of the article). I installed a Western Digital drive exactly like the old drive and my fans are still going nuts! The LCD temperature sensor cable is located here on the motherboard: If the Optical Drive and/or CPU fan shows the fans spinning over 2,000rpm – then it is the LCD sensor cable that most likely isn’t fully seated. The second most common reason that the fans on the iMac go haywire is when replacing a Western Digital drive with another Western Digital drive. Western Digital drives have an 8 pin connection for plugging the temperature sensor cable into. However, that temperature sensor cable has but two wires (one light and one dark) and only 6 pin sockets. This results in four different ways you can plug that cable into the drive, but only one way that sends the right signal down the right wires. We found something interesting while testing our current Western Digital drives. In the 2009 iMac, they did not work correctly in the configuration that they were officially supposed to. This is the way Apple officially states that the WD temperature sensor should plug into drives in the late 2009 iMacs (cable plugged in closest to the SATA connector with the light cable closest to the PCB board on the drive):Īnd for the late 2010 iMacs, Apple says that the sensor’s position should be reversed.
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