Key board of dv6 is not working properly

dv6-2106eo model number and product: wd366ea#uuw,Windows 7 64-bit,
key board use to malfunction like if i type a the cap lock goes on , if type d something else comes on screen(some of those keys are working fine but some are totally mixed up ), previously it was fine but once i tried to clean the fan with pressurised air  without opening any of those screw ( dit it from outside ) then it happened , any suggestion will be welcomed 

Hum. Cleaning off the keyboard with air should not have made the keyboard not function properly. I would recommend working though this document to make sure the keyboard language is set up properly:
Incorrect Characters are Displayed when Using Keyboard
Let me know if this resolves the issue. 
Thanks!
Sean
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