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Nov 16, 2014 9:16 AM in response to fnottinby Eric Root,Hold down the option/alt key during a restart - can you select the Mac there?
If not, do a backup. Boot to the Recovery Volume (command - R on a restart or hold down the option key during a restart and select Recovery Volume). Run Disk Utility Verify/Repair and Repair Permissions until you get no errors. Then re-install the OS.