What should I do if the camera's not working and mac can't find it?

The camers's not working. When I open Photo Booth there's a line says "Camera is not turned on". The same thing in other programs deals with camera. What should I do?

You should be able to select Force Quit from the menu beneath the Apple icon in Finder
and choose to Quit iPhoto from there, without messing up the Mac OS X in the process.
OS X - Support
Not sure if rebuilding the iPhoto library would help this issue. However if you had to
turn off the computer without the correct method (unplug, etc; instead of menu choice)
the system may have accrued damages and should be checked, maybe repaired by
use of the Disk Utility in the system. Or restart the computer in Safe Boot mode, then
run 'repair disk permissions' while it is running in that reduced mode; then restart after.
•Understanding Safe Mode - tuts+ computer skills tutorial:
http://computers.tutsplus.com/tutorials/understanding-safe-mode--mac-59897
•OS X: What is Safe Boot, Safe Mode?
Suggestions on how to use Safe Mode in article, to resolve issues, may be helpful.
There likely are other means to rectify troublesome applications, including reinstall.
Be sure to backup your music, image, video, and other work on an external drive
or suitable device as a precaution against loss should there be a hard drive failure.
iPhoto - Mac Apps - Apple Support
There should be some tips and help information using iPhoto via this tiny Support link.
Good luck & happy computing!

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