Try disconnect the ribbon cable from DMD and the wire that gives power to it and +5V power wire to DMD controller board(if this machine have this board).Power on the game.If the game boot and work power of and begin to put again first ribbon cabelePower on,if work,turn of and put next one +5V wire to the controller board.Power on.If it work again then turn of and put and the power cable to the DMD.Power on and see what will happen.
I think you get the idea.