center button stopped working

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just today my center button does not work? is there something i dont see that can dissable it or is it hardware failure? how long was the warranty on the streak 5, i purchased it about a year ago.
thanks

Warranty is 1 year, if you bought it in 2011 you still have a short amount of time to get it serviced.

i called dell and they are sending a refurbished phone to me but should i worry about what rom i have on it? i am running 360 rooted now so will i be ok if i just hard reset the phone before returning it? and how bad are the replacement phones they said they would send a phone restored to working condition yikes
thanks