Screen won't show but flickers periodically for a moment

We bought this tablet as an open box tablet (I am guessing maybe refurbished) from a Major store. It had issues freezing when we bought it but we did a system update and that seemed to resolve. This hasn't been dropped, no water damage and only used for less than a month. This morning, we thought the tablet didn't charge as it wouldn't turn on however when plugging it in, the screen flickered (it was the screen that shows when turning it on). I have tried pushing the power and home buttons together but nothing changes. It has been flashing probably 1 time every minute or sometimes even within seconds but will not stay on. Any thoughts?