step 1 once the screen is on SUFACE press and hold the power button for 30 seconds the screen so be totally black.
step 2 press the power once to turn it back on (if it doesn't fix go to step 3).
step 3 press and hold the volume up and the power button for 15 seconds ( the screen should flash some stuff but keep holding for a total of 15 seconds.
step 4 press the power button to turn it back on it should take a while (like 5 minutes