I have a VW11HT projector, ceiling mounted. When I'm using Component Video, the picture is fine, but using S-Video, I have a horizontal line that scrolls up and down the screen... it alternates white and black. Sometimes it distorts the screen badly enough that the projector needs to reset itself (1/2 second outage). This problem is intermittent; sometimes the screen is crystal clear. There is an electrical box in the ceiling that has an outlet in it. The projector is plugged into an APC Line-R Conditioner that is plugged into the outlet. The ground from the projector is screwed into the back of the APC box. This electrical box gets its power from a switch in my living room. I've since replaced the switch with a switch/outlet combo (using the same ground as the box in the ceiling) and all my components are plugged into that. I've also connected a different S-Video cable directly from digital cable box to projector (it typical runs through a Sony STRV444ES). Same result. I don't know where else to check for interference. Can anyone help?