I fired up bh last night, and the game turned on, lights came on, sound came on, but score board didn't light or the credit/ball counter either. I hit start button, and nothing. I turned off/on machine again, and this time it released two balls on it's own, and the playfield lights were off. I plunged them into field, flippers wouldn't work. Then after plunging 3 balls, game kicked on like normal and I played 2 games until it stopped like I tilted and it started saying several times "oh no". I checked all connections, and fuses, and found nothing. The tilt light was on during the odd operating time as well. This went on for about 40 minutes while I kept checking connectors, and resetting machine. After messing with it for a while, the game started working fine again. It's working this morning again fine, but what in the world could have caused this. I've heard something about a slam switch possibly? Any ideas that I should be aware of if this happens again?

Also, I wanted to get a video of it but now I can't as it's not acting up anymore.

All ground mods are done and battery was removed with no damage. It was playing fine today now. It's a great machine, just freaked out on me last night with its weird antics. Thanks for the ideas to look at