Question about Dell (Fan Only) M/N AFC0912DE, DC12V, 2.50A, D/N P2780 P2780

1 Answer

Fan I have a dell computer and during start up, the fan runs extremely fast to the point it seems like it is going to explode. My computer won't start because of this happening. I used to be able to try starting it over and over and sometimes after 5 or 10 tries the fan would slow down and the computer would start. But sometmes after a while it would lock up or shut itself down.

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  • Mike929963 May 08, 2008

    same problem. fan runs very high all the time

  • Anonymous May 27, 2008

    Same problem with ADC0912DE- Fan sounds like a jet engine.

  • Anonymous Dec 01, 2008


    I have the same problem with a Inspiron 530 - how to find out what is wrong in the POST check ?

    Best regard


  • holtwood5 Jan 27, 2009

    Same problem - PC is a Dell 8400 P4 3.4ghz with Windows XP professional. Nothing major done to computer...working fine up until now. I did have it running a few times and then it would hang up. I tried disconnecting everything except mouse, monitor and keyboard - still locked up. At this time, it dosen't boot and fan runs at very high speed.

  • Anonymous Feb 16, 2009

    8400 2,8 GHz cpu
    Same problem.


  • John Timermanis
    John Timermanis Apr 16, 2009

    Hi have the same problem, same DELL 8400 Desktop machine running XP home. The issue only started happening recently (have had the machine for several years now) the CPU cooling fan just started racing (seriously fast) not sure if it will blow or if it is able to run at this speed by design. I found that this seemed to be caused by a bad connection in a plug on the mother board next to the CPU. This has two yellow and two black wires on it. I found two of the pins inside the plug were scorched (brown) and the side of the plug scorched also. Reseating the plug seemed to fix the problem temporarily but after a few restarts, the racing fan would happen again. As of this morning, I cannot get the computer to start normally at all, that is monitor not connecting (green light) and fan running at normal speed. Tried resetting the BIOS but this has not made any difference. I am not sure if the problem is purely related to that plug (with yellow / black wires) being truly unserviceable now. Would like some feedback please. Thanks John Timermanis

  • IQUIT May 11, 2010

    You have it backwards. The fans are racing because the system is not completing the POWER on Self-Test (POST). One of the symptoms of a POST failure is the cooling fans running 100%. Under normal circumstances, they go to 100% then slow after the srlf-test completes.

    The fact that the system eventually completes POST and boots indicates that you may have a heat issue where one component is not making contact until the system board warms up during several starts. Sometimes a slow spin up of the hard drive will have the same symptom.

    Post the model information of your system (Example Dimension 2400, Inspiron 530 etc) and I might be able to give you some more detailed advice.


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No reply

Can't help without details, sorry

Posted on Jun 11, 2008

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