i just got nba jam for my jamma cabinet, but the game just loops back after doing the initial rom check. not sure why this is happening (i'm new at all this), but i can get to the test menu. when i get there all the tests seem to check out, but i can't change any of the dip switch settings. it doesn't matter which switches i throw it says all of them are always on. any help on either problem would be much appreciated.