My Lumia 640 blacks out after logging in, why?

[WPCentral Question]

my Lumia 640 blacks out after logging in

When I unlock into my Lumia 640 phone, it only shows a black screen. I tried to restarting by pressing the power and volume buttons, but still the same, it starts the lock screen, I can enter my password and unlock, but only show a black screen.

I appreciate if you can help.

 

[ML10]

Re: my Lumia 640 blacks out after logging in

Try pulling the battery, or the sd card if you have