I bought a FA brand new back in the 80's used for years until I made the switch to digital. I removed the batteries and store it my dresser draw. I actually sold the camera and they returned it saying it did not work. It worked perfectly when I stored it. Now I installed new batteries and the film advance will not cock. The shutter button moves up and down freely and everything else seem to work. I put on a 35-135 Nikon manual focus lens that I used to use on that camera and when I look through the view finder it is very dark. I can see through it but it is dark. Any suggestions on what is wrong with it.