I have an external Isight for Mac Pro. Running SL 10.8.2.. ISight just wont work. 've looked at many things that could be the problem from Variety of sources. Snow Leopard, Another app is open, reset PRAM on and on. Can anyone help with this nothing had worked. It's not cam , I actually purchased another one on the cheap. Also, USB to firewire dongle. Any help would be appreciated. Fire wire ports work but I Sight not seen in system pref. Thanks