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Question: My Mac Book Pro will not work after installing latest update

Mac book pro will not start after latest update

Mac mini, OS X Mountain Lion (10.8.3)

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All I had was the sign-on screen. When I would put in my log=in the screen would go blank. I solved the problem by re-booting in recovery mode and re-installing the OS.

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User profile for user: mernoyh

Question: My Mac Book Pro will not work after installing latest update