I have the RetroDuo which I bought brand new from a seller on eBay for $50.

However, when I first plugged in the RCA cables and turned it on with a SNES game inside, the screen came up with a noise line scrolling across the screen and the colors were green-purple. I was thinking that maybe the SNES mode only works with S-Video, however I do not have proper S-Video connections to test it out. But I've seen videos of it on Youtube running SNES with RCA without any problems, so I assume I recieved a defect console, unless there is a solution. Does anyone know what the problem is?