Open the iMac and remove the HDD following iFixit’s instructions One can even find some online shops which list the mentioned jumper plug (however, either out of stock or for ridiculous prices). Careful modification of the existing hard drive power cable should allow one to perform this hack while installing any drive of his or her choice - albeit while running the risk of having the drive overheat. Apparently tying the temperature-sense pin in the connector to ground signals to the BMC to just leave the fan at its base speed. It’s just a plug that goes into the HDD power connector that shorts pins 2 and 7. Towards the end, it shows what Apple did on iMacs which were delivered with just an SSD and no HDD: Some more in-depth research brought me to this article (on ). However, I didn’t want to replace the HDD but simply remove it (the HDD was never used, the internal SSD has enough capacity as a system/working drive for me, and I prefer a computer with as little spinning parts as possible). In case one wants to replace a defective HDD, his solution is definitely the way to go. As noted by Allan, just removing the HDD effectively means removing the integrated temperature sensor.
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