Shift and window getting pressed together T420 keyboard.

Hello, 
I have T420 laptop. From yesterday I am facing an issue that when I press the left shift key, windows key is also pressed. the same happens when I press the window key.
Is this a hardware issue or software?
-Rahul

hey rahulagarwal,
hard to say if its hardware or software, I would recommend that you use the Hardware Maintenance Manual to clean the keyboard.
that might be some grime that is causing this.
http://support.lenovo.com/en_US/guides-and-manuals/detail.page?DocID=UM006438
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