Camera not detected MacBook Pro

Hey guys,

My MacBook doesn't recognise the built in camera and I have already tried typing "sudo killall VDCAssistant" in the terminal. It comes up with "no matching processes were found" after I type in my password.

I tried to fully erase everything after buying the laptop second hand and accidentally turned off the computer a bit early. I had to then restart and upload the software which came up with Mountain Lion and I then updated it back to the newest software.

Apparently the camera worked before that all happened so maybe I did something with it then?

Any idea what could have gone wrong and how to fix it?