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I just started this build yesterday, and this is my first build so I'm not entirely sure where the problem lies. The parts in use and in question are listed below:

-Asus Sabertooth x79 mobo
-Cooler Master Hyper 212 Evo

Everything else seems to be working properly on initial boot except for this heat sink. I have this fan plugged into the correct 4-pin CPU_FAN located on the top of the mobo. When I get to the POST it tells me there is a "CPU Fan Error" and to "Press F1 to Run Setup" which leads me to the BIOS.

In the advance settings it displays N/A along side the CPU Fan, which leads me to think its not picking it up or detecting it. I have also tried changing the upper limit of the fan to a lower temperature to see if a higher temperature would trigger the fan, but no success yet. I've included pictures of the mobo connection, POST, and BIOS screens. Any advice to get the fan up and running will be greatly appreciated.

7 answers Last reply Best Answer
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  1. Welcome to Tom's Forum! :)

    I have the same MOBO and by the looks of it you're not doing anything wrong. Just to make certain it's nothing more than the CM 212 EVO fan, try plugging the rear exhaust fan in the CPU_FAN header and reboot.
  2. Just for reference here's mine:
  3. Thanks for the reply!

    I took you suggestion and plugged the rear exhaust fan into the CPU Fan Header and it worked once I booted it. I'm guessing the problem lies in the CM 212 EVO rather than the MOBO so I guess I should bring that in and get it replaced.

    Unless you have other suggestions that could be the reasoning?

    Thanks for your help!
  4. Best answer
    The signal wire on the CM 212 EVO's fan is 'bad' which is the real issue. My best advice is to contact either Cooler Master or your retailer and request a replacement fan -- that solution is by far easiest on everyone involved.

    For the meantime I'd simply use, if you have one, a spare 120mm fan until this can get sorted out.


    Try the CM fan in a different 'FAN Header' and see what happens.
  5. Best answer selected by ASchlute.
  6. Suggestion for installing Windows 7, I recommend you follow this Guide -

    Good Luck! :sol:

    PM me if you have any questions, I'm always there to help a fellow Sabertooth X79 owner.
  7. This topic has been closed by Nikorr
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