I bought a Colecovision with games at a flea market a few weeks back but the graphics aren't displaying right. Nothing is clear in any of the games because it's always filled with a garbled mess. It can't be the games' fault because the bootup screen shows the same problems without a cartridge inserted. I'm hoping this problem isn't too complicated to fix or doesn't involve a power switch replacement like I've read in the other CV threads...can someone help?