Mac Book Camera?

When I try to open out photo booth on my MacBook, it says that the camera isn't attached, even though the camera is built into the monitor of the laptop. Any thought how to make the camera ACTUALLY be attached? I've already tried restarting my computer, by the means of access.

Thanks in advanced!

Answer:
1. Have you tried repairing disk permissions?
2. Have you reset your NVRAM?
3. Have you consulted an Apple service technician?
4. Have you reinstalled your operating system?

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