20in Aluminum iMac Circuirty Noise

Discussion in 'iMac' started by dataset, Dec 3, 2007.

  1. dataset macrumors member

    Jun 27, 2007
    La Mirada, California, United States Of America
    Whenever I have headphones connected to my 20in Aluminum iMac, I can occasionally here faint but still audible blips and high pitch ringing, like circuitry noise. It seems to only happen when there is no audio being played and once audio starts being played the circuitry noise stops. Its very random.

    Does anyone know what could be causing this? There are no wireless devices (other than wifi..) and does the same thing with different headphones. I know its not an application because it does it when I have no apps or unnormal processes running. Could it be the GPU or CPU causing noise?
  2. leeroy777 macrumors newbie

    Jan 4, 2008
    Circuitry Noise

    I'm having the same problem with my imac that I just purchased.Absolutly no wireless around.I have stereo monitors hooked up through the headphone jack.Seems to be a product flaw.The noise sucks!

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