I have an old Cannon AE-1 that isnt working perfectly but has done me some good service. Recently, Ive gotten the urge to drag it out and try to get some creative photos taken, but the camera will work when there is no film in it - the shutter works when the button is pressed - but doesnt seem to want to work when there is film inside. Has anyone had a problem like this - is it fixable, or is it time for a new camera. Thanks!