Hello and thank you for your question. I look forward to assisting you today. Check the Live View switch next to the Mode Switch on the top of the camera. Make sure that is turned on and let me know.
Any damage to the camera that you are aware of?
Also, what condition are the batteries in? How old are they and can you tell if they are charging fully by how long the camera stays running?
A couple of things to try. Go into the setup menu and check the monitor brightness level and auto info display setting. Try adjusting both to see if the screen will respond then let me know.
My apologies. I thought just the Liveview was not working? If you have no menu visible, then there is most likely a problem internally. You may want to send it to someone other than Nikon however if you need it back quickly?
Since I wasn't able to resolve anything for you, you can request a refund at this link: http://ww2.justanswer.com/contact-us