Chosen Solution
Hello! I’ve a problem with my macmini. Until now it was very noiseless, but by some weeks it’s very noisy. The fan rise is speed to 5500rpm random, without reason. I’ve brougt it to the local Apple store but the “Genius” said to me that there are no problem with the hardware, in his opinion it’s a software problem. But after two initializations, the mac is the same. What can I do?
There’s a chance that the fans and heatsinks have become clogged with dust. I recommend opening the computer using this guide, and cleaning out any dust/debris.
I hate to state the obvious, but your fan may be failing. First trying lubing it with some graphite. Peal up the sticker on the fan and put some in the hole. That failing replace the fan, here’s how: Mac mini Model A1283 Fan Replacement
download fan control for mac. that should solve the problem.
have your performed a PRAM and SMC reset? if not, try those. to reset the PRAM, press “command + option + P + R” on your keyboard during the post (before the chime) and wait for a second chime. the SMC might have already been reset if you went to an apple store, as it would be reset after 10 second of getting no power.
i 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!
Everyone who replaces HDD in most of iMac models faces the problem that HDD fan will start to spin at maximum speed after the replacement. This speed is about 6000-7000 RPM and the noise produced is unbearable (it happens because Apple puts special firmware in its HDDs)! What is more - you cannot just switch off the fan or put it rotating at MIN value (actually it’s OK but only for SSD), because it will cause HDD overheating.
