Why is my charger not working?

Why doesn'ty Nextbook 8 NX785QC8G charge? I have tried using multiple chargers . It displays the battery charging image a few moments, then display disappears. After charging for at least an hour I turn Nextbook on. A white screen with NEXTBOOK is displayed for 3-5 seconds, then turns off on own with no other display/image. I've tried the battery repair situation, still doesn't work. What else could be the problem?