I have the same problem. Yesterday i received my cube and was trying to install a clean win10. During installation the screen freezes sometimes, sometimes bluescreen. I tried it 3 times. I thought i could be driver related so i started installing drivers during setup. Then i was a while away while setup was running. As i came back the screen was black. I tried powerbutton, resetbutton both together and so on. Nothing worked.
But i think it is screen or driver related, because it looks like it starts into basic uefi, because after pressing the power button 3 sec. the windows key on the tablet reacts with vibration. After pressing it again for 5 sec it doesnt react anymore. I have left it some time in this vibration mode and the battery went down, so it is really working, but doesn´t show anything. So have someone an idea what to do anymore? Can i hardwarereset the UEFI? Or is there something i can type blindfolded into UEFI prompt to change screen, or reset it? Or force it from the outside via usb?
I hope someone has an idea or can look into his own UEFI Prompt if there is something.