flamepanther wrote:I've seen this. Messing with your video cables or buying a different SNES or TV will never fix it.
It comes from "dirty power" out of the electrical outlet.
Usually, some device near your SNES is dumping noise in to the A/C outlet, and your SNES is picking it up. It could be a bad power strip or surge protector, if you're lucky. In my case, I can't have my SNES and my Game Doctor plugged into the same power strip. If I move them apart, they're fine. Hypothetically though, worst case scenario, there could be something wrong with the power in the whole house.
That my good chum, makes the most sense I've heard so far (more than chip revisions etc).