HT204448: About the OS X Mavericks v10.9.2 Update
Learn about About the OS X Mavericks v10.9.2 Update
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Helpful answers
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Mar 13, 2014 4:25 AM in response to kamalgeorgeby Barney-15E,Try an SMC reset: http://support.apple.com/kb/ht3964
Another option would be to install the Combo Update (yes, again): http://support.apple.com/kb/DL1726
If those don't solve it, take it in for repair.