I have a Canon AE-1 film camera, and the shutter will not fire. When I received the camera, I advanced the film advance lever, and everything appeared to work fine. The shutter moved to the left, and the film winder spun. But when I press the shutter release button, nothing happens. The button still depresses, but the shutter will not fire, and the mirror doesn't move at all. The film advance lever doesn't move, since the entire shutter is over to the side. The light meter works, and I put a brand new battery in it, which I was advised may fix the problem, but alas it did not. I just wondered if anybody knew what the problem may be, and what it would cost to fix, or if it is something very simple that I could just pop the top off the camera and fix myself.