Hi my name is ***** ***** I will be the expert working with you today to help and resolve the problem you have posted.
I am sorry to hear that you are having such trouble. I will try my best to help you out and resolve the problem as quick as possible.
push and hold down the power button for 45 seconds it will shut down.
Unplug the ac adapter if connected while following the reset step.
wait for 3 min and then power it back on and let me know what screen you are in.
Thanks for the detailed information you have provided regarding the problem, I want you to try reset your Microsoft account password ***** the following link given below and then try to login to the Tab. Lets you the option to provide a pin as well. let me know the input device works to let you enter the password ***** the pin.