Put the car in Park
Press and hold both scroll wheels on the steering wheel until the screen goes black
Release the scroll wheels and wait for the Tesla screen to restart
If needed, hold the brake pedal and press both scroll wheels again
For a full power cycle, exit the car, close all doors, and wait about 2 minutes
Re-enter the car and press the brake pedal to wake it up
If the touchscreen is frozen, try a soft reboot first before using a full power cycle