Someone recently gave me an older Canon Owl AF-7. It is like the one listed as a possible camera. Here is my problem. I put in batteries to test it out, but it does not have a digital readout and does not flash and advance film when I press the shutter button. I do here a mechanical click inside though. I don't want to tear it apart and ruin it if it will not work. Should I put film in the camera to try it out? I am going to leave it on for a few hours to listen for the click, but I am not sure if this is enough. If anyone else has any onfo it would be greatly appreciated.