ISight stopped working on my macbook pro

Over the past couple of days my iSight has been randomly stopped working. I will be on iChat and all of the video icons will turn into phone icons as if I do not have a webcam. I check iChat and it says "There is no camera attached to this computer." I open photo booth and nothing will show up.
The problem was off and on for awhile but now it just has stopped working entirely... I've restarted my macbook and it doesn't change anything.
I really don't know what to do... Please help!

Hello Professor Tim
... MODERATOR PLEASE HELP!!
What help do you need from a Moderator? (Apple currently calls them Hosts.)
If you can tell me what you need a Host to do, I can pass them a message.
Shouldn't need a Service Center call....
As another long time Mac user, I can offer you some other suggestions that may help you resolve your problem without a trip to an Apple Service Technician.
Because you are having problems with multiple (but not all) applications, I agree that your problem is software. All Apple video capable apps use components from QuickTime in addition the software in the application proper. If reinstalling the two apps that do not work does not resolve your problem, try reinstalling QuickTime, too.
If none of those reinstalls help, some of your other OS X system software may be damaged. How I eliminate that possibility and restore proper function is shown in this post:
http://discussions.apple.com/thread.jspa?messageID=9458954&#9458954
If you have a Time Machine Backup, restoring your system software and problem applications from before your problem began may be the quickest and simplest way to repair the software component that is causing your current symptoms. (Remember to backup important files separately before you begin restoring software.)
If you do not use Time Machine, or if your Time Machine restore does not provide lasting resolution, you can always try a proper Combo Update reinstall, A&I, and Erase&Install as suggested in the link above.
You can try Apple's suggestions from http://support.apple.com/kb/HT2090 at each stage or your restore effort to determine which action corrects your problem.
We will watch for your response. Hopefully, you can report a fix!
Cheers,
EZ Jim
G5 DP 1.8GHz w/Mac OS X (10.5.6) PowerBook 1.67GHz (10.4.11) iBookSE 366MHz (10.3.9) External iSight

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