1. Check whether the time in the upper left corner is updated and the system is blocked
2. Check whether there are foreign bodies or dirt on the touch screen.
3. Is the touch screen cracked?whole screen cannot touch or only some area?
4. Restart the machine and check whether it can be restored. Really can not restart or shut down normally, you can pull out the battery, unplug the power and reload the battery verification.
5.please contact with after sale engineer for further check (1)reconnect screen cable (2)replace touch screen (3)replace mother board