What to do when screen of ZTE Avail 2 went blank and never came back on?

My zte z992 screen went blank one day and never came back on. you can hear it coming on but nothing on the screen, even the red light will come on. what's the problem and how do I fix it?

Hi ejw. When you plug in your phone to a computer, does the screen light up and show it's charging?

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