I just replaced the cracked screen on my Imac 21.5 mid 2014. The problem I have is that before I could not even tell when the fan was running, this Imac was quiet. Well now as soon as I click the power button the FAN starts running at full speed and it will not stop at all.
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You'll need to see what the sensors are doing. Download this app: Temperature Gauge Pro. Paste a screenshot into your question so we can see it as well.
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If rpm=0 then control the fan connector , could be a fake contact of the rotation sensor , slightly pulls the wire into the connector , I have solved this way the problem
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This sounds like an issue from older iMacs. Please confirm your exact machine by giving us the last four figures of your serial number.
por mayer