Sounds like Game Over relay is in trip position . In this case the game over light will be lit , outhole relay won't work but flippers and bumpers will.

Game Over relay will be latched when you press credit button via a switch on coin relay (wire colours prob yellow one side and red/green on the other) . Make sure that when you press the credit button that
a) coin relay energises
b) that switch on the coin relay is closed when coin relay energises