No, there isn't an option or preference thing, because it shouldn't turn off. If its not coming up in Photobooth, then make sure you have all the latest software updates on your computer (go to the Apple in the top left, and Software Updates).
well I updated the software and my computer took 15 mins to restart. I think because I downloaded this AIM program called adium it might be messing with my computer
but when I finally just shut it down my self and restarted it my camera came on.
so..thanks for all the advice
I'll have more questions-- believe me ahah.
Open photobooth or another program that uses the camera.
Or have a lurk around in system prefrences to see if it has anything on the camera.
I tried that theres not like an option or a preferences thing