Samsung Tab A (with S pen) stuck in opening screen

[Android Central Question]

I have a Samsung Galaxy Tab A with S Pen. It had more than 80% battery in the morning but I tried starting it now and it seemed to be out of battery. So, I put it on recharge and started the Tab. Initially it showed the Android man and something like "installing updates" and then it showed a series is statements like "E:failed to start/dev/block/platform...." The Tab went into a loop between these two screens.

I then disconnected the charging. After I attached the charger again, the tab is stuck in the opening screen (Saying Samsung Galaxy Tab A with S Pen" and "Powered By android". Also the screen is flickering? What went wrong?