Thanks everyone. Some aditional info. When I took not the back off but the ring that connects the film back to the body it started working like a champ. So it appears there is something about that ring that is blocking it. Could that be the RB out of alignment??? Is there some interlock on that ring itself?? Could the ring be defective?? Do I need film in there if that ring is on? Could there be soething broken in the body where it connects to the ring? At least I know roughtly where the issue is.