My Macbook won't recognize its own camera

Recently, I've been trying to access my webcam but both Google Chrome, Safari, and my computer claim that it doesn't exist. I know for a fact that the camera is there, and works, having used it in the past, but all of a sudden it seems to have stopped being recognized.

I've tried changing my systems preferences and everything, and when it stopped working I hadn't changed anything. My Macbook is a Macbook OS X from 2009 running 10.9.4 and has no updates.

Just an example of what my computer is telling me about my camera, and I don't know where else to go. Any help anyone could give me would be so helpful, thank you.