I ran the same issue approx. a month ago.
The warranty just expired and the device "dead". PErfect construction from DELL.. congrats.
but.. I didn't give up. I put the device to dock and started to play.. I played alomost two weeks..
Battery out - battery in tries to start... I succeed.
Let's reflash the BIOS -don't need newer, can be the same, just re-flash it. That go to WIndows update and turn it off!
Since I made this mine is working fine.