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When I turn on /off goes to some kind of terminal

Hello everybody,

I have a Macbook Pro Retina A1502 2015 when I turn on and off the machine it goes to some kind of screen like in terminal and checks something. I don't know what is mean?!!

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@armin1

Can you add a photos by following this guide here

Adding images to a new question

just so we can get a better idea of what’s going on

Thanks:-)

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