After installing the latest update for Mavericks and restarting, my Mac just displays the Apple logo and the spinning wheel. What can I do to fix this?

I installed the latest update of Mavericks from the App Store today and after restarting my system it doesn't go beyond the Apple logo and the spinning wheel. I tried resetting the NVRAM but it still has the same problem.

1. Startup in Safe Mode
    http://support.apple.com/kb/PH14204
2. Repair Disk.
    Steps 1 through 7
    http://support.apple.com/kb/PH5836

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After installing the latest update for Mavericks and restarting, my Mac just displays the Apple logo and the spinning wheel. What can I do to fix this?

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