I had the same problem, I SOLVED THE PROBLEM AS FOLLOWS
It was impossible to login to the laptop because it was impossible to type the access PIN, my key stucked was 0, so in every text form an infinite sequence of zero occurred.
If you are in this condition put the laptop in your freezer for 20 minute, possibly in an envelope. After it the temperature of the laptop will be close to zero and login will be possible. The problem is temporarily solved, but don’t wait too long because as the the temperature will rise, you will have again the problem.
Install sharpkeys software and block the key where you have the problem (for me was 0). Reboot.
Problem solved, but you won’t be able anymore to type that character on your keyboard…
