Hello, I have an iPad Pro 11 whose touchscreen stopped working. It has been used for 4 years, mostly for youtube and reading books, the battery is still great. What happens is this: when I press the power button, the lock screen appears, but I can't unlock it because the touchscreen doesn't work. I tried to reset it by pressing the volume button up, down and holding the power button, release it when the apple logo appears. I tried to connect it to the PC on iTunes, but it throws a message on the screen that it must be unlocked first in order to connect. I also tried to connect the mouse via usbA-usbC adapter but it shows the same message. Please help because this really doesn't make sense, I have the impression that the tablet is programmed to lock itself after 4 years in order to make extra money for repairing, I believe, a bizarre 'problem'. Is there anything else I can do before taking it to the service center?