Why aren't my three soft buttons working on my Nokia Lumia 925?

[WPCentral Question]

Nokia Lumia 925

I ve installed the WP 8.1 in my lumia 925, and i noticed that the three soft buttons don't light any more......What's the problem???

 

[xandros9]

Re: Nokia Lumia 925

Is battery saver active?
Is the ambient area dark enough?
have you done a soft reset?

 

[Nickos Moralis]

Re: Nokia Lumia 925

I ve just done a hard reset and the problem solved