How do I stop my fan running continuously?

My fan runs continuously and is very noisy.  I have reset the SMU but the problem persists.

Hello
first question to ask is , why my fan run continuously ?
try use Apple Hardware Test software to answer , could be a temperature problem , fan problem , temp sensor problem ..
AHT is locate into your original grey CD , try run and report any error may help to understand your problem
AHT could be run to hold on at start up "D" key on keyboard , depend on your imac model / system version
HTH
Pierre

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