Why do I have a black screen with yellow margin on it on my Lumia 520?

[WPCentral Question]

Black screen with yellow margin on Lumia 520

My young daughter was playing with my Lumia 520, now it has a black screen with a yellow margin, and a voice repeating every action I attempt to make but the screen remains frozen.

 

[Low Kok Hin]

Re: Black screen with yellow margin on Lumia 520

Did you activated the narrator functions accidently?

 

[Low Kok Hin]

Re: Black screen with yellow margin on Lumia 520

Try hold and press the start button after that.