Why do I have diagonal lines rolling accorss my HDTV?

Question

I have had diagonal lines rolling accross my TV when watching my Scientific American DVR cable box connected to COMP-1, regardless of the channel, SD/HD. Recently I switched the DVR to HDMI and the lines are not there. My Wii is on a "multi-console" component video cable connected to COMP-2, and never have had the lines there (or with any other device). I connected my PS3 to the same cable (PS3 was using my single HDMI input before) and now I have the lines on the Wii and the PS3 (both connected through the same cable to COMP-2). Other devices have been connected to COMP-1 without the lines. The pattern doesn't make sense to me. Any ideas?

Answer 1

It seems like interference.

Switch off (not just standby but total power off) the equipment you are not using and your problem will be solved.