Lately my iMac's (late 2012 i7 quad-core HT) fan would fire off under moderate load. Seemed to me to be over the top.
I planned to take it apart and clean out dust which I believed might be
the culprit. Taking apart the iMac is not a light effort: probably 1
hour+ in and out to do it well.
So I decided to do an SMC reset / PRAM reset instead before embarking on
that task.
I began with the PRAM reset.
That seems to have resolved the issue - so didn't bother with the SMC
offset.
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