I upgraded my Mac Mini's HDD to a new SSD… Since then the fan has been running at full speed constantly. I placed back the old drive but that did not fix the problem. I also tried using SmcFanControl but that does not work at all.
In addition, I reseated the fan connector just to be sure, still no joy. Can anyone recommend another option?
I'm running Yosemite…
Best Answer
check the thermal sensors. I broke one off of my Mac mini trying to upgrade the HDD and the fan ran at full speed since. I had to replace the Logic Board to fix the problem.