A good friend of mine sent me a message saying that his internal iSight wasn’t working anymore on his MacBook.
For this issue the first thing to do would be to go to the Disk Utility, Applications -> Utilities -> Disk Utility. Then click on Macintosh HD, then click “Repair Permissions”
This should clear up any issues that your hard drive is having with the iSight.
Yet for some people this doesn’t work. The next step is to shut down your laptop, and remove the battery. Hold down the power button for 5-10 seconds with the battery still out, then put the battery back in and turn on the machine.
This should clear out the system BIOS for any issues with the iSight as well. From there, if your iSight continues to malfunction it is most likely hardware based, and unless you want to void your warranty you need to at least take to it apple care.
Keep a straight head,