Ok I give up on my NEO GEO. The screen's colors are going off (left half is dull) and it rolls slightly at different parts of the game. I don't have another monitor to test it with and I don't plan on keeping a NEO GEO in my game list so I might as well sell it and convert the cab. I'm pretty sure the monitor is the problem and not the game or board. It has a Samurai Showdown II cart + marquee. If I had a supergun I'd keep it around but alas, very bottom of my list of things to make.
I can ship any part of this machine if interested.