My LG Stylo 3 won't turn on

Apr 18, 2018
I had my phone plugged into the charger when I was watching a video. Then the screen out of no where turned black (it was still on, but the screen was still black.) So I pressed on and off the power button to see if the screen will turn back to normal but it didnt. Then I took out the battery because it would not respond, but now when I try to turn it on it makes this buzzing sound. By this buzzing sound, it sounds just like when I slight put my finger on the power button to unlock my phone, but it constantly does that noise.
It won't turn on, but the screen is just all black and it constantly does that noise.
I also tried to factory reset it, but that screen won't pop up.

What should I do?