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Helpful answers
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Jan 4, 2014 6:13 AM in response to mrslau3by dominic23,Hope info from this article is helpful.
http://support.apple.com/kb/HT2090
Reset SMC. http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".
If this does not help, contact Apple.
Best.
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Jan 4, 2014 9:23 AM in response to mrslau3by EZ Jim,Dominic has offered good suggestions. Two additional ideas:
Sometimes simply restarting Mac fixes things.
If not, use your Mac's Disk Utility to repair permissions.
Then download and apply the latest Combo Update for your Mac OS.
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 the camera. For hardware help, contact Apple or an Apple-Authorized Service Provider for service.