Hello guys, I am having a trouble with the camera when doing Facetime. Normally it works fine but sometimes even though facetime app is running camera does not turn on automatically and I cannnot see the green light next to the camera. When I shut down the mac and restart, it works back again. Could this caused by the fact that I do not shut down the system? I normally do not shut down as I prefer sleep mode. Or is it some kind of fault?