I have problem with built-in isight camera.
MacBook Air, OS X Mavericks (10.9.2)
Posted on Apr 13, 2014 7:36 AM
Q: resetting PMU for my macbook air
iSight camera failure after OS X 10.9 Mavericks update
If your are having difficulty resetting the PMU, follow the instructions in Intel-based Macs: Resetting the System Management Controller (SMC). Specifically, use the process in the item entitled "Resetting the SMC on portables with a battery you should not remove on your own".