Assuming that the viewfinder curtain is out of the way, it sounds like the mirror is locked up.
I would take the battery out, make sure it has a full charge and try again.
Put the battery in, turn the dial on the top left of the camera to the “S”, single exposure setting and turn the camera on.
Does that solve the issue?
Is the mirror locked up for cleaning? Check that in your settings too.
If not, you need to see a Nikon technician as there may be a physical issue with the mirror.
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