Wired Keyboard some keys not working

Hi there,
have been using an external wired apple keyboard on macbook pro retina for 6 month.
Apple Keyboard with Numeric Keypad - English (USA)
Suddenly 3 keys just stopped working:
u / m / j
checked the keyboard on an old macbook from 2008 - all keys are all working fine on this one.
Any idea what it could be???
thanks a lot in advance.
bungalow

Hello bungalow2014
Check out the article below for further troubleshooting options for your keyboard. One other thing to check is to open Keyboard Viewer to see if there is anything else being pressed while hitting those keys.
One or more keys on the keyboard do not respond
http://support.apple.com/kb/ts1381
Regards,
-Norm G.

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Welcome to the HP Support Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
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