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nambuccaheadsau

macrumors 68020
Oct 19, 2007
2,024
510
Blue Mountains NSW Australia
First up is that loud bash two seconds or so from the end part of the noise?

Sounds very much like a fan. Hard drives usually have more of a clicking noise. Hard drive ever been replaced? If so was a heat sensor kit used?
 
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chscag

macrumors 601
Feb 17, 2008
4,622
1,946
Fort Worth, Texas
It does sound like a fan. Now you have to figure out which one since your 2011 iMac has three fans running. You can probably tell which is the noisy fan by using something like iStat Menus that gives a readout of the RPM for each fan.
 
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bazeboiee

macrumors newbie
Original poster
Apr 23, 2017
4
0
Ok cool thanks for the update. I think it must be the fan bottom right but I'll double check. Sound is louder over that side and I haven't replaced a thing in it yet except for upgrading the memory.
 

bazeboiee

macrumors newbie
Original poster
Apr 23, 2017
4
0
Btw the loud noise at the end isn't part of it, that was me moving around the iMac.
 

kschendel

macrumors 65816
Dec 9, 2014
1,282
557
I've heard hard drives with bearing problems make similar noises, but HDD bearing noise is steady, not wavering like that. I'll agree with it being fan noise.
 
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