I am taking advantage of our cable operator's promotion of digital cable free for 90 days. I have the video and audio both running from the cable box to the receiver. The problem I am running into is a humming noise in the audio connection. This does not occur when using my other equipment. I have played with the connections but still get the noise. I know from past experiences when this occurred while listening to my turntable that the ground connection came loose. Any help would be appreciated!