My Samsung HL-S6187W has a high pitch humming noise when the TV is off. I have talked to Samsung about this and the service tech stated that it was the first time he ever heard of this issue when the tv is not on. Does anyone know what this could be? I don't think that it could be the color wheel as the tv is not operating. The tv is only six months old and would like to know if this is a sign of things to come. Thanks