Lenovo G580 the key "{/[" in the keyboard is not working.Pls help.

Hi,
I recently bought this laptop less than a month ago.  few day earlier this paranthesis key is not working any more.  Laptop keyboard is without any dust or blemish. I am running ubuntu and when I checked there is no press/release event being registered, using XEV package. I also ran the system with live cd same issue. Tried removing the key and cleaning the interior, nothing helps. 
Is this a problem with some connection in the keyboard?  I cannot think of any software issues since It was working fine couple days ago? 
Help would be greatly appreciated since I am in the middle of writing my dessertation.

Hi
Welcome To Lenovo Community
We are really sorry to hear about the issue you are facing,  
Based on what I read from the post, it seems to be a hardware issue with the keyboard
Please contact Local Lenovo support to have system verified
http://support.lenovo.com/en_IN/feedback/detail.page?LegacyDocID=MIGR-76613
Do give this a try and let us know  
Hope This Helps
Cheers!!!
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