there's a multitude of problem areas with this particular game.
I say first order of business is to pull the JAMMA harness off the board and inspect the smaller side of the JAMMA edge. are two of the contacts burned up at all? the other thing is that the power supply is probably original, I won't go as far as to say it's bad, but they're prone to the +5 adjustments getting oxidized which in turn triggers the overcurrent protection on the power supply, resulting in it appearing dead. there's a fix for this, but I don't encourage doing it with your board, and I doubt you have the tools or means necessary for putting the proper load on it to test the +5 output voltage with the JAMMA harness disconnected.
if you want more details, PM me.