Wait...
I think I know what it is!
When you watch a DVD or video or whatever... you use speakers to hear the sound, right? Speakers work by making electrified copper wires interact with a permanent magnet, oscillating at certain frequencies. This can cause static electricity in faulty or badly made speakers, and in larger systems, a small amount of em radiation. THIS is what will be causing your screen to go wierd. Just like how old scalextric slot cars cause your TV to go strange because the little cars don't have interferance suppressors in them.
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