Dizzy mother of two exasperated . Since boyfriend, trying to be helpful, re installed the operating system 10-4-11 my i Sight camera does not work with Photo Booth, or Skype. It says: Make sure your digital video camera is properly attached and turned on. If you are using the camera with another application, close that application before trying to open Photo Booth again. I am not using the iSight camera with another application!! HELP!