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Sierra after second boot black screen

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Hello friends. I install Niresh Sierra on desktop dell optiplex, and setup goes well. After setup I boot on my Sierra with all components working. Graphich, audio, internet all. I wait until notification says SETUP COMPLETED. But, after first shutdown and start up, it goes to clover  I select Sierra and now it stuck at black screen (graphics not working). Nvidia gt 640. Any help please?

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