Macbook iSight is DARK

in Genius Bar edited January 2014
when I'm on my macbook, and i open a program such as imovie, that enables the isight, i can see picture at first and then it goes completely dark. i've tried restarting my computer, some times when i restart, i can see my self fine at first, and then it goes a little dark, and then if i shine a light at it, it darkens that out, and goes 100% dark. do you know how to fix this?
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