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  1. #1
    Star Lounger
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    Thumbs up

    This weird sound is a bit like a motorboat and:

    - happens immediately when my PC does its auto shutdown
    - never happens at startup or while running
    - began maybe three weeks ago (no hardware changes in a long time)
    - sometimes gradually decreases in volume and frequency until it's gone
    - sometimes stays at a constant volume and frequency
    - is present whether the power comes from my APC UPS or the wall outlet
    - stops when the power plug is pulled

    I have seen no issues in my Device Manager or Event Viewer. Memory tests show no errors.

    My machine does not run games and is not overclocked. I built it 6 years ago and it has been
    troublefree except for a hard disk failure a year ago.

    Has anybody experienced something similar?

  2. #2
    Super Moderator CLiNT's Avatar
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    I have not experienced that, but my system is newer.
    Do you have a sound card installed, or on-board sound?
    DRIVE IMAGING
    Invest a little time and energy in a well thought out BACKUP regimen and you will have minimal down time, and headache.

    Build your own system; get everything you want and nothing you don't.
    Latest Build:
    ASUS X99 Deluxe, Core i7-5960X, Corsair Hydro H100i, Plextor M6e 256GB M.2 SSD, Corsair DOMINATOR Platinum 32GB DDR4@2666, W8.1 64 bit,
    EVGA GTX980, Seasonic PLATINUM-1000W PSU, MountainMods U2-UFO Case, and 7 other internal drives.

  3. #3
    Star Lounger
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    The sound is onboard from a Realtec AC 97...

  4. #4
    Super Moderator CLiNT's Avatar
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    Attempt to rule out the speekers by attaching a different set, preferably newer.
    DRIVE IMAGING
    Invest a little time and energy in a well thought out BACKUP regimen and you will have minimal down time, and headache.

    Build your own system; get everything you want and nothing you don't.
    Latest Build:
    ASUS X99 Deluxe, Core i7-5960X, Corsair Hydro H100i, Plextor M6e 256GB M.2 SSD, Corsair DOMINATOR Platinum 32GB DDR4@2666, W8.1 64 bit,
    EVGA GTX980, Seasonic PLATINUM-1000W PSU, MountainMods U2-UFO Case, and 7 other internal drives.

  5. #5
    Star Lounger
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    My monitor has its own speakers, and the noise will come from them if I disconnect the others.

  6. #6
    New Lounger
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    This sound is often caused by interference from cell phones.

  7. #7
    Star Lounger
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    I posted this question, and here's my answer.

    I did an extensive search and found only one helpful item, where a similar issue was resolved by, believe it or not,
    replacing the PC power supply.

    I then did some closer checking and found that the putt-putt noise through my speakers was apparently related
    to the power supply fan. Here's the weird one: the fan continued to run at a very low speed after the computer
    shut itself off AND when the machine was plugged in but not turned on. Sometimes the noise would eventually stop and
    sometimes not. Even more weird, the machine would not boot unless the putt-putts had completely stopped.

    I replaced the power supply, and presto! no more motorboating! I'm just soooo glad that the power supply problem did no
    discernable damage to the mobo and the rest of the components.

    Thanks to all who responded. I hope this will be helpful to somebody else someday...

    - JM -

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