Trying to update the OS on one of my macbook pros.  stuck on purple screen

trying to update OS on macbook pro.  stuck on purple screen

Hello, danfromlake nebagamon.  
Thank you for visiting Apple Support Communities.  
I see you are experiencing an issue while updating your Mac.  Here is an article that I would go through for this issue.  
Mac OS X: Gray screen appears during startup
Cheers, 
Jason H.  

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    Take each of these steps that you haven't already tried. Stop when the problem is resolved.
    To restart an unresponsive computer, press and hold the power button for a few seconds until the power shuts off, then release, wait a few more seconds, and press it again briefly.
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