Hold the home and power button at same time and check for either apple logo or battery symbol meaning it’s charging, as primary approach. Secondly you can charge the divice and if nothing comes up. It just means that your iPad is out of power so charge it until it turns on. Then as soon as you see your lockscreen, press the sleep button once to lock it straight away to save power. If failed. Just let it charge until it gets some power stored on its own.
This is the solution for the problem.
Thank u.