Why is there a gray bar flashing on my screen?

Alright I have looked for someone with my same problem but so far I have not found anything that helps. I was playing a game on my tablet when it shut off and two vertical gray bars appeared on the side on my screen. I tried charging it but all that happens is those two bars flashing on the screen or on occasions the charging battery will flash on the screen instead. However, it is not charging at all. I've tried to hard reset (volume up+power button) but it is not responding to that. I've tried holding all three buttons down, not responding. I've even tried volume down+power and nothing. I'm very concerned because it is only a month old and I have not dropped it at all. I have no idea what to do, please I'm desperate please someone help me!

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