My uncle gave me his snes and some games he found when he was cleaning out his parents house. and i found FF2!!(FF4 really) and i wanted to play it but its not working. but most of the other games are. The screen looks like this( see attachment). the FF logo ends up in diffrent places around the screen each time. my uncle said it could be the older games had betterys in them and that could be it. Anyone know a good way to clean it, how to replace the battery, or a safe way to open the cartridge?