Might be a stab in the dark - But check all Slam/Bounce Switches (CAB,BACKBOX,PF and COIN DOOR) -If they are supposed to be closed,clean contacts,if supposed to be open(Slide a piece of plastic over them) and finally check the Ball outhole contacts arent too close.
All quick checks but eliminate them as I spent 1 week solving resetting and dead machine symptoms and these buggers were the culprit. 
And remember dont give up, leave it for a day or so and try again.
Kev
I concur - and YES it is easy just to walk away and tackle the problem with a fresh mind.
Another obvious consideration - Have you checked that your "tilt" light is working ? You say it is "not tiliting" - but if the light is dead - how do you know ?
