Mobile phone gone and stays black?

Re
3

Hi, I have a ZTE Axon 7 mini. Yesterday it just went out and since then I can't do it anymore. The screen stays black. I've already tried loading it, tried it on and connected it to my laptop but it did not work. Can someone help me?

Ge

Hold down the power button for 10 seconds.

Re

Unfortunately did not work, but thanks for the help

Ge

That has it really NEN damage…