Why is my tablet not turning on?

I recently bought a Insignia Flex Elite tablet online. The other day it froze and shut off while I was using it. Since this was a reoccurring instance I just left it alone on it's charger I usually use. The next morning I tried turning it on, but it fails to respond to anything I do.

Here's what I've done:

-Plug into original charger

-Use a paperclip/tool (I have a tool for these things) to push the reset button . No dice.

-Hard reset via the power button, up/down ( I tried them both) for 10-30 seconds) also didn't work.

-Left it to charge for several hours, still would not turn on. I changed outlets, plugs, everything except a sacrifice.

My boyfriend has the same tablet but did not have this same problem (yet). Mine has been in a case since I first got it, and hasn't been dropped or thrown or exposed to moisture. It also had a full battery when it died.

Any information is helpful! I've scoured the internet with not much luck, so I hope for some information!