Hello. I have a MBP 17" 2010. iSight was working fine for a year. Recently, whenever I launch Photo Booth, I get a black screen. I tried iChat but under audio/video, it also says either that there is no camera connected to this computer or another application is using it. The LED indicator is off all the time. Does that mean the iSight camera is dead? Could it be a software issue due to 10.6.8? I upgraded it when it was available. Can't recall if the iSight problem started before or after I upgraded to 10.6.8. Thanks.