Problem Xperia Z1

[Lorena16]

I have been with botton turn on/off. Maybe lost sensibility. Besides I had a problem with the screen, touch a letter and  not responding. Thank you, and I hope I'll resolving my problem.

[_alexdon_]

Try to boot the phone in safe mode:

http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008