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Horrible Noise from Speakers after Case Change

Discussion in 'Hardware' started by nildefects, Jun 29, 2011.

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  1. nildefects

    nildefects Thread Starter

    Joined:
    Apr 3, 2007
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    Hi,
    I have just recently bought a new case for my desktop as it was having overheat problems.
    The new case has 4 cooling fans.
    Once everything was connected and turned on I noticed a horrible static type noise from the speakers that stays at the same volume no matter where the volume has been set.
    I use a M-Audio 2496 sound card. I thought it had blown. So removed it and reloaded the onboard drivers. Still the noise.
    The static noise seems to come about with hard drive activity. i.e. the flashing hard drive light?
    The new case fans have LEDS. Could this cause a problem?
    The hard drive holder mounts the drives on rubber stops. I thought maybe they needed to be earthed, but when i touched an earth cable to the 2 hard drives , no difference.
    Appreciate any help?
     
  2. win2kpro

    win2kpro

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    Jul 19, 2005
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    11,670
    When you installed the motherboard did you get the motherboard stand-offs (risers) in the correct position?
     
  3. nildefects

    nildefects Thread Starter

    Joined:
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    Hi, Thanks for your reply.
    I installed them in the same positions as the previous case. Although the previous case didn't have risers. The case was moulded to hold the motherboard up.
    It does sound like an earth sound. Do you think the mobo isn't properly earthed?
     
  4. win2kpro

    win2kpro

    Joined:
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    If the board has onboard audio did you disable the onboard audio in BIOS?

    If you disabled the onboard audio in BIOS and the problem remains, the next thing I would try is to loosen the screws that attach the motherboard to the stand-offs so that they are just "snug" enough (not tight) and see if you still get the noise. If the noise disappears you have just tightened the board too tight so that a board component is partially shorting to the chassis.

    If you still get the noise, I would remove the board, build it up on a non conductive surface outside the chassis and try it again to see if the noise remains. If the noise disappears you have a problem with the board installation in the chassis. If the noise remains, you have a problem with the board or a board component.
     
  5. nildefects

    nildefects Thread Starter

    Joined:
    Apr 3, 2007
    Messages:
    133
    Thanks for your advise.
    I removed the board, power supply and hard drives and placed them on a rubber mat.
    Powered up and the noise reduced.
    Placed it back and the noise started again.
    I then removed the graphics card and the noise remained.
    I can't see how the mobo could be touching anything as the risers are well spread out.
    I will now try the BIOS thing you mentioned.
    Then I'm going to place it in the old case again to see what happens.
     
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