HT204291 I am getting a green screen from my imac on apple tv. the apple tv is fine and tested with another imac

Can anyone help, I am getting a green screen on mirroring my imac to an apple tv. I have checked with another imac on the same network so its not a network issue.

http://osxdaily.com/2014/10/17/os-x-yosemite-installation-stuck/
also use the Command-L to view logs during installation

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