Trouble powering computer up after OS X update...

I tried to update my OS X system but now I can't get my computer to boot up completely. A status bar comes on and gets about a third of the way complete and then shuts down. Anyone have any suggestions on how to fix this? I got the computer from Apple in 2012. Any suggestions would be greatly appreciated!

I tried to update my OS X system but now I can't get my computer to boot up completely. A status bar comes on and gets about a third of the way complete and then shuts down. Anyone have any suggestions on how to fix this? I got the computer from Apple in 2012. Any suggestions would be greatly appreciated!

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    Hmmn. I just sat up and said, "I swear to God." No offense meant.The dadgummed thing is working.
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    ------------------------------------------------- Where we go to------------------------------------------------------
    Hi,
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