I Bought a Macbook Ae1811 and it keeps saying there is no camera connected
I bought a macbook ae1811 and i've had it for two days. When I go to open photobooth or try to use any app that requires the camera it says there is no camera connected. I have restarted it, I updated it to Yosemite I even opened Terminal and copy pasted "sudo killall VDCAssistant" as many have requested and still it says there is no camera connected. What do I do?
MacBook, OS X Yosemite (10.10.2)