I would start with what Ken said, reseat all of your socketed chips after you have cleaned the legs. If that doesn't solve it, check the voltages coming out of the power supply.
its actually a game i was looking at buying, I was just looking for a little heads up on what the problem might be before i buy it, if i buy it. funds are tight and i dont want to get into anything that is going to be a very expensive repair. . .