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Original post by: michael ,


I had the same problem when I swapped out the HD in my imac 27" mid-2011 with an SSD drive.  I believe the fan began running full throttle because it did not know how to process the temperature readings of the new drive etc.

I searched online and came across this website -

(Parenthetically- I am not that tech savvy but I do not recall seeing or detaching a temp sensor or wire)

I installed their program and have not had any problems since (it's been at least 6 months).

Good Luck!