Why did my isight camera come on by itself

My isight camera came on by itself. I admit that skype was running, but I was not talking to anyone.
The next day the isight cameara came on for less than a second and went off.
Why would this happen?

ArisB wrote: ... Why would this happen?
Because either:
(1) you (or someone else) have added software that turns the camera on and off automatically, or
(2) something is wrong with your Mac's hardware or software.
If you did not do the first and have given others access to your Mac, you can eliminate (1).
Here is how I would work the second possibility: Uninstall (follow Skype's uninstall instructions) Skype. Then restart Mac, use Disk Utility to repair permissions, and then test your camera again. Follow the suggestions inApple's http://support.apple.com/kb/HT2090 article.
If the camera works correctly now, reinstall the latest Skype that is compatible with your Mac. If the problem returns when you install Skype and goes away whenever you uninstall it, Skype must be causing a conflict that results in your camera's unexpected behavior. Search or post in Skype's dedicated support pages for help for this Skype-specific problem.
If the problem continues even when Skype is properly uninstalled, post back with as much info as you can provide on the latest behavior. Confirm that you have used the proper SMC/PMU reset from the Troubleshooting article, and tell us which (if any) apps and user accounts work properly and which do not. We will offer more specific suggestions based on the details in your reply.
Message was edited by: EZ Jim
Mac OSX 10.7.3

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Why does my iSight camera periodically stop working, requiring PMU reset?

Just wondering why this happens?
Using a Feb 2011 Macbook Pro with OSX Lion 10.7.4
It seems that every time i use my built-in iSight camera, then the next time i go to use it, it can not be found. This requires that I reset the PMU, which is kind of annoying. Then it works for a few weeks and the cycle of iSight begins again.
Why does this happen? It seems pretty trivial to consistently recognize a camera which is wired into my computer. Is there something I could do to prevent this from happening again? I have tried turning it on and off again.
And currently, this article is linking to the reset instructions for Intel iMac instead of the Macbook Pro page...
http://support.apple.com/kb/HT2090
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dcunited001 wrote: ... Just wondering why this happens? ...
Because something is wrong.
dcunited001 wrote: ... Is there something I could do to prevent this from happening again? ...
One of the following will fix it.
(0) If you need help with the following suggestions,
      you might rather contact your local retailer or
      Apple Authorized Service Provider (AASP) for help.
      They can help you or determine whether your Mac
      needs hardware service or only a software problem.
(1) Close all open apps that use the camera and then
     try again with only one app running at a time.
     If the problem continues, delete any Log-In items and
     Dashboard Widgets that might be using your camera.
(2) Try Apple's http://support.apple.com/kb/HT2090
     Be sure to use the correct SMC/PMU reset procedure
     for your particular MBP model: model with a battery
     you should not remove on your own
     If these suggestions do not help, yours may be a
     hardware problem that will require a professional fix.
    Unless you have a current backup, make one now.
    Then use the final "Troubleshooting" suggestion:
"... contact Apple or an Apple-Authorized Service Provider for service."
(3) If you want to try one more thing on your own first,
     you can use Disk Utility to repair permissions. Then
     download and apply the latest Lion Combo Update:
      http://support.apple.com/kb/DL1524
    Repair permissions again immediately following the
    system restart that completes the Combo update.
Properly applying the Combo version of updates can sometimes correct software problems, but, if your trouble is caused by a hardware problem, there are no user serviceable parts of iSight. See your AASP for hardware problems.
dcunited001 wrote: ... article is linking to the reset instructions for Intel iMac instead of the Macbook Pro page...
The article actually has THREE links to TWO different SMU/PMU reset instructions:
• iMac G5 (iSight),
• Intel-based iMacs;
• MacBook and MacBook Pro
You should use the last one ( http://support.apple.com/kb/HT3964 ) Yes, it is the same article as for iNtel-based iMacs, but it is the correct one for you.
The important thing is to page down to the section entitled "Resetting the System Management Controller (SMC)".   Then click the reveal triangle ( ▶ ) to see and carefully follow the specific reset instructions for "Resetting the SMC on portables with a battery you should not remove on your own". This is the proper reset process for your "Feb 2011 Macbook Pro".
Message was edited by: EZ Jim
Mac OSX 10.7.4

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