After installing Maverick on my iMac, the computer shuts down during boot up. Suggestion?

I installed on an iMac purchased new in January 2013 with full specs, the computer shuts down every time the desktop begins to load.  I've reinstalled Maverick twice from Restore screen, all to no avail.  I don't have any recent Time machine back ups to restore from because of external hard drive failure.  Have a few thousand dollars worth of software on the computer that won't be replaced if not deactivated, so would hate to lose it all, but most of my data is in Drop box. Any suggestions?

Have you tried booting into the Recovery HD, selecting Disk Utility>Macintosh HD>Repair Disk to see if any repairs are needed.? If anything gets fixed/altered click on repair disk again until you get a clean pass. Restart as normal from the Apple menu. To do this, restart holding down Command + r (more details here: http://support.apple.com/kb/HT4718 ).

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