Help Weird button behaviour - unlock button

[sathisp]

I am having problem with the screen unlock button. Whenevr I press the unlock button - it takes me to the shutdown/silence screen. I tried calling from some other phone, so the screen got unlocked but the keeyboard keeps on poping up. Tried factory rest but of no use.

Any help / suggestions?

 

[bluemax]

Stuck Shutdown/Hangup button?