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  1. #1
    New Lounger
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    Unhappy CPU fan cyles fast/slow - annoying noise

    The computer is three years old but is fast and runs Win 7 ultimate. It just started making an annoying noise. It is definitely the fan on the mother board very close to the CPU (Intel Pentium 4 something). The cycle is faster than once a second and mimics a hard drive write. Touching the mother board clearly isolates the vibration and one can see the fan speed up and slow down. At first I thought something was overheating but it does this as soon as the computer turns on and continues indefinitely.

    OK - "Replace the fan" That is a major nuisance and I am hoping that some really clever person has a neat solution; e.g. oil it or twist the board (scary) or something like that.

    There are some old threads about noisy fans but those descriptions don't seem to fit my situation.

    Thanks in advance. I have gotten some really clever advice on this forum.

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  3. #2
    Silver Lounger Banyarola's Avatar
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    If you haven't done this already I would first try blowing it out with a can of air...Maybe there is some dust interfering with it's operation.
    "If You Are Reading This In English, Thank A VET"

  4. #3
    Super Moderator RetiredGeek's Avatar
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    Heritage,

    Bany's suggestion is a good one but remember to use a pencil or similar object to prevent the fan from spinning while cleaning it. HTH
    May the Forces of good computing be with you!

    RG

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  5. #4
    New Lounger
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    Success: Thanks. Not sure what actually solved the problem since I did several things while the case was opened.

    I had already cleaned this fan as part of a general refurbishing of the computer. However,I took the fan out and cleaned it with a Q-tip dipped in alcohol since some grimy dust remained. Then I oiled with light machine oil. Not sure that is a good idea but I was desperate.

    Before doing anything, I removed the fan from the mother board and turned on the computer for a few seconds. The fan continued to speed up and slow down so I don't think it was the mounting screws and certainly not an overheating problem. What surprised me was that the problem didn't surface until several hours after I started refurbishing the computer.

    Back to together and Voila - no noise. THANKS.

    (I refurbish donated computers and give them to local non-profits. I am definitely an amateur but I have seen a lot of old computers. I have seen a lot of weird problems. About half I toss but the rest are greatly appreciated. This one with Win 7 Ultimate and a 3.2 GHz processor and 2 GB RAM is much too good to toss.)

  6. #5
    Super Moderator RetiredGeek's Avatar
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    Heritage,

    Glad you got it sorted. Keep up the good work as you help people and keep stuff out of the landfills wins all around!
    May the Forces of good computing be with you!

    RG

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  7. #6
    Super Moderator CLiNT's Avatar
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    Nice job on your own fix.

    Sometimes dust gets caked in the CPU heatsink fan and needs cleaning, sometimes those push pins on the MB loosen up a bit and require tightening.
    On rare occasions the CPU fan does need to be replaced.

    If you are capable of opening up the case and doing some rudimentary troubleshooting, then you are far ahead of the crowd.
    DRIVE IMAGING
    Invest a little time and energy in a well thought out BACKUP regimen and you will have minimal down time, and headache.

    Windows 8.1, 64 bit
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