"Why my mac mini is so noisy?"에 답변i had replaced the harddisk for an SSD and after turnin it on the fan went to 5100 tpm. very noisy. after reading seeral blogs i tried to remove an sensor of the harddisk temperature bu it was the same. i noticed the wire on the logic board of the harddisk was not so good connected and when i put it together the fan did his work properly and the nois was gone! look at he wire connection on the board connected to the hard disk!