All showing off sounds like still missing power on one of those boards. Try measuring VOLTAGE on each fuse with respect to machine ground (metal anywhere). Perhaps you will find a missing one? The big io board runs on 24vdc IIRC; sometimes one of the 24Vdc pcb traces gets blown off. I have helped customers in the past get running again by soldering on wire jumpers around the blown traces. Just an idea until someone who really knows answers!