electronic hiss on stereo hooked up to iTunes

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I have hooked up my Flat Screen Mac G4 to Onkyo Stereo (brand new) using Griffin iMic to USB. Whenever I listen to iTunes there is a lot of "background" noise. Is there a way to lower this or get rid of it without losing sound quality or volume. BTW, when TV is played through Onkyo there is no "background " noise. Thanks