Big problem, Galaxy nexus lock button and turn off
I am very worried, having try to put Nova Launcher as app system, but unsuccessfully. I have reboot the telephone and maintaining everything works but when I lock it, then I try to unlock it, the screen turn on 1 second and turn off directly! I cannot make nothing more !
The screen turn on 1 second, and turn off, but i can unlock it and go to the launcher, I feel the vibrations, but I cannot see nothing! The screen remains black lick it is turn off.
Maybe I touched something that it was not necessary, good, in system app... but i don't think...
Any idea please ??? Thank's a lot.