as john stated it is a video problem of some kind.first thing to do is check the cable coming into your house.9 out of ten times thats what it is. go to radio shack and buy yourself a ground filter its only 2 bucks.believe me after installing my very expensive system,which hummmed like crazy it was embarrasing to find out that a 2 dollar filter from radio shack cured it.check the cable and vcr and t.v.!!!
good luck harry
good luck harry