[alxxunder]

Hello, a month ago I bought Nokia Lumia 2520 and I tried to repair the device from the most common 'lock screen problem'. I was switching it off and on over and over, and lsuddenly my hard buttons stopped working! Including 'power' button, 'volume' button and sensor 'home' button. Need your help, guys.
Sincerely yours.

[JimmyRandall]

Take it back to where you had it from and show them. Sounds like you have broke it.

[wapoz]

I had a similar issue, but couldn't find any info about it through google/bing searches or by posting on here. I ended up just exchanging it out since it was under 14 days. You'll have to get yours serviced by Nokia now that it's been a month since you purchased it.