Do you have a CATV or satellite connected to the system? If so, they are usually grounded to the house ground and will cause a hum when connected to the system. Hook everything up and then disconnect this lead. If the hum goes away... voila! I use a MAGIC ground isolation transformer for my CATV and have absolutely no hum. If this is not the problem, then try an inexpensive set of Monster Cable component cables. IMO Monster does video better than anyone.
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