Big problem, Galaxy nexus lock button and turn off

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Hello,

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.

I had a similar problem when I installed Light Flow for the first time. Just remove the Nova Launcher, reboot the phone, download Nova Launcher from the web again, then reinstall.

Thank's for your answer. But I removed Nova launcher and reboot the phone but nothing ... same problem ...
I have Lightflow too but before I never had this problem ...