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Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

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Fan is running very fast

After replacing the video card in my iMac, it boots and operates perfectly except one of the fans is running way too fast. I believe it is the cpu fan.

I downloaded TGP. It shows all temperatures are good. Cpu fan is running at 3600 and is red.

Any idea why?

Thank you,

Richard

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Sounds like you may have pulled one of the wires out of the fan header plugged into the logic board, in this case the tach wire.

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2 Comments:

Hi Dan,

I pulled iMac back apart and checked all fan connections. I unplugged and plugged back in. I also checked polarity on all connections. Still no luck.

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Then its time for a new fan unit and hope, thats it!

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Richard Neson will be eternally grateful.
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