I have just updated my 2013 MacBook Pro 13 inch with 10.10 Yosemite, but now I can't webcast.
How do I turn the camera back on?
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Hi I had the exact same problem. Played around with terminal and figured out a way to reset the camera. Just open terminal, paste this in to it, and then press Return:
sudo killall VDCAssistant
This seems to be a bug. I experience the same problem after upgrading to 10.10.1. See Apple Discussions for some ideas to solve it (resetting SMC). But since the proposed solutions are not consistently helping to solve the problem, I really suspect a driver problem. My System Profiler is showing "No video capture devices were found." Alternatively you could try to connect an external USB camera.