Since the 10.9.2 update I have had problems with the iSight in my Apple Cinema Display 27". It is the A1316, i.e. the non-thunderbolt version. The iSight is simply not working. It isn't listed in the System Report under Camera, but funny enough it is listed under USB, as Display iSight. I pulled the power, I changed USB plug, and I checked everything I know to check. Anyone?