Nexis is an Android. Android is just the operating system the Nexus runs on, it's not a brand of tablet.
Try holding in the power button for about 30 seconds, then have it charge for about an hour and try again.
If that does not help, try starting a restore setup but cancel if it before it starts the process or it will wipe the tablet.
https/support.google.com/nexus/answer/4596836?hl=en If that does not work or you can't see anything on the screen doing it, you need to have the device checked, the screen may be bad or something else is bad on the system board.