I was just playing video games (league of legends), then suddenly, the green light next to my isight camera on my Imac turns on, and a telephone like ringing sound is emitted through my headphones. Just as i notice it, the sound stops, and the camera turns off. Then, after i quit my game, i start playing another game (minecraft) and after a few minutes, the camera turns on again and the sound reappears. this time, i go check my notifications for any calls from Skype or FaceTime, and the notification bar is empty so i went on google and started searching for answers. My Imac is one and a half months old and has mcafee security. If anyone knows the answer please reply