Quoted from Linkage:Also do system 11 cabs have a universal key by any chance? I assume not. I've never had the head open and don't have a key. Hoping there is no board damage. I get the message "Factory Setting" is displayed on startup, and need to reset the pin to get it started.
Hopefully there is no battery damage and the thing is just dead or removed.
Did you check the inside of the coin door for the key to the backbox? They are supposed to hang on a little wire loop on the inside of the coin door.
RM