Shorted display perhaps?? I've seen it a few times where the driver chips on the displays fail and short out the 60 volt line.

Yes same here , Ive come across this problem from a blown out capacitor on one of the displays ,
 Disconnect all displays and  just plug one display in and see if that works , if not ,
 Is there a fuse for the displays near the smaller transformer? , check that also , if this game has one ..