Well my first guess would be that you might have used too large capacitors? They would take a longer time to get charge, would run on a different charge cycle (possible flickering) and would keep power up for longer than intended.
I would guess this is also a capacitor issue, or possibly a bad LCD screen. You should try it out with other games as well of course. Capacitors go bad over time and they affect screen and sound and needs to be replaced. You can find good guides now if you google it, does require solvering thought.