The scariest thing I ever saw on my computer: I had been playing the new Beta for around 20-30min when it made some kind of brief ping-pong-ball-crushing noise and everything shutdowned instantly. In 1/10 second, the computer was dead;I couldn't even restart it later so I decided to cut power and I started it normally the day after.
It didn't seem to be overheating and there was no special fan noise before.
I have given up finding the dmp file but here is the debug.err. Hope it helps for I am scared to open the Beta again.