When I turn the computer on there’s a black screen with a small file and a blinking

When I turn the computer on there’s a black screen with a small file and a blinking?

My computer will not start up I have tried holding down the command in the option and the shift in the control different ways starting and restarting to no avail please help somebody I need to use my computer today it is 2015. MacBook Pro my name is Kim

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