There are three main ground problems that cause problems in an audio / video system. These are ground loops, improper grounding and lack of a ground altogether.

If the noise is caused by a cable box, the noise is likely caused by the cable TV ground. If the noise is eliminated by disconnecting the TV cable, the problem is the cable TV ground. You can electrically decouple the cable TV feed from your system with a ground breaking transformer. If you get a ground loop, current flows between the two components.

Sometimes power conditioners will stop noise problems by placing equipment on different, electrically isolated outlets.

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