iMac shows " Enter your system lock PIN code to unlock this MAC"

I work in my iMac and unexpectedly computer get restart and shows " Enter your system lock PIN code to unlock this MAC". What is it? What can i do?

iMac, Mac OS X (10.7.5)

Posted on Aug 8, 2015 10:56 AM

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iMac shows " Enter your system lock PIN code to unlock this MAC"

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