Will not boot up with maverick installed

MAC PRO WILL NOT BOOT UP AFTER INSTALLING MAVERICK

I know it can appear like Mavericks is causing an issue, but really what has happened is the installation has uncovered some operating system issues that previously existed. It's typically best to backup your data and perform an Erase & Reinstall before doing an Mac OS X upgrade. This ensure you get a good, clean, stable copy of the OS before moving forward.
All the same, if you're getting a gray/white screen at startup, try following the steps in this KB article
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/TS2570

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