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Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7, ID iMac11,3

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Cpu fan running on full speed while starting up

I cleaned my old mac from dust, collected everything and the CPU FAN started working at full speed when the computer started. In the "Macs Fan Control" it showed zero fan speed, although everything was connected and checked

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Clearly you CPU fan has failed! iMac Intel 27" (Late 2009-Mid 2011) CPU Fan

crwdns2886500:0Replace a malfunctioning or noisy fan that cools the CPU compatible with the A1312 Model Late 2009 to Mid 2011 iMac Intel 27". Part #922-9499, 610-0151, 922-9151, 610-0064, 922-9871 , 069-4384.crwdne2886500:0

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iMac Intel 27" (Late 2009-Mid 2011) CPU Fan

$24.99

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Only one solution to change it?

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@?????? - The motor and/or the tach has failed.

You could take it out and check motors windings resistance and if applying some air flow to it the tach reports voltage. But in the end its' time for a new part.

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forgot to say, i have 2 ssds, one installed at optical drive

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@?????? - and that changes things?

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@danj - He Might be saying that because it could affect the fans because of the thermal sensor for the SSDs

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