Bought a Wii for Christmas, and am trying to hook it up to our plasma that is connected to a DISH HD-DVR. The TV is mounted above the fireplace and we can't get to the TV inputs w/o tearing up the framing. We can get a black and white picture with sound, but as we switch cables around we lose the picture. We don't have a HDMI cable attached to the TV, there are the three red, yellow, white cables and then there are three thicker red, blue, and green cables that are hooked to the box and TV. Any help or ideas appreciated, thanks.