I have also had this problem several times in the past. Power conditioners, filters, cords, and such will have absolutel no effect on this problem. For a cheap fix, you can go to RadioShack and get a "ground loop isolator". This is basically as set of cheap RCA's witht he isolator on them. It works 100%. If you want t spend the extra money you ca get a MAGIC. For details on the MAGIC, as well as info on eliminating these, you can go to Michael Elliot's website, altavistaaudio.com, and go to the hums and buzzes section. He has links to retailers of the high end tiems. After years of struggling with this problem via expensive audiophile/videaphile fixes, and even disco'ing the cable when listening to music, a friend brought over the $8 Radio Shac fix and it worked like a charm. Hope this helps.
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