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Model A1418 / Mid 2014 / 1.4, 2.7 & 2.9 GHz Core i5 or 3.1 GHz Core i7 Processor

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The fan runs continously at full speed

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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This sounds like an issue from older iMacs. Please confirm your exact machine by giving us the last four figures of your serial number.

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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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Fernasr56 sera éternellement reconnaissant.
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