I have had my iMac for about three years now and suddenly a few days ago, iPhoto stopped opening automatically when I plug in my Canon camera. I've never had this issue and can't find the camera in the Source list, either. My PC (of all things!) still opens automatically and can find my photos, so I know that the cord and camera works fine. I also tested the USB port and it works with everything else. Did I accidentally turn off a setting in iPhoto? Everything I've looked up says that you can only set the settings for iPhoto when you first set up your computer, but I find this hard to believe. Thanks for your help!