Computer won't boot after installing latest iTunes update

Won't boot after the apple screen.  Turns black and disk stops  Help!  Was running Mavericks.

Hi Neodoc,
Welcome to the Apple Support Communities! I understand that your MacBook Pro will not boot past the Apple logo. There may be a few troubleshooting steps I would recommend for this situation. The following article outlines the steps to perform to get this resolved for you.
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/ts2570
I hope this helps,   
-Joe

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