The screen has turned black though the home icon and the back and the option icon is still shining.

[AC Question]

I have a one plus one. It was getting a bit laggy so i switched it off and turned it on. When i turned it one the screen was black but the icons on the bottom of the screen are still shining. (The option,home and back icon). What should i do? Pleas help

 

[B. Diddy]

Welcome to Android Central! Did you power the phone down completely, or just turn the screen off? Is this what happens when you reboot the phone?