Fix internal MacBook camera if it stops working

I purchased a new MacBook recently. A few days after its purchase, the internal camera stopped working. Launching iChat or PhotoBooth activated the camera displaying the green light. The Apple System Profiler also showed that the camera was installed under the USB section. Everything looked good, except that the picture was black.

I read through the forums everywhere, and none of the obvious solutions worked. Zapping the PRAM didn't help. Restarting into Single User mode and then restarting again didn't help. But one trick did get my internal MacBook camera working again:

Solution to fix your black screen camera on your MacBook:

1) Shut down your Mac.
2) Remove the battery and plug power sources.
3) Hold the on/off Power switch button on your Mac for 5 seconds.
4) Reconnect the battery and turn your Mac back on. That should re-enable your internal iSight camera.