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Message: <blockquote data-quote="mm1352000" data-source="post: 877969" data-attributes="member: 82144">Hmmm. Sounds like you're investigating the right things. Common grounding is usually the place to start, but these problems can still arise when there are loops further "downstream" in the (source and amp connections). I take it you haven't got anything else plugged into the amp? I would try lifting the ground pin on either the amp or HTPC if you have an appropriate adapter. Also, if the HTPC has onboard audio I would try that too to see if it is isolated to the one sound output - I'd expect it wouldn't be but still an interesting check. Try checking the voltage on the outer "sheath" of the RCA connectors as well if you can. I have found that they can sometimes be a problem. mm</blockquote>