I have the most recent Macbook Pro unibody and upgraded to Snow Leopard. Now my iSight says it working fine but only give me a black screen. No hardware issue, all software. Apple support boards don't have a fix for this (did reinstall, clean install, PRAM, NVRAM) and no dice. Anyone come across this problem? I didn't even notice it until the other day because I hardly use my webcam and turned on Photo Booth by accident.