Keyboard keys not working only after you install the new OS Sierra

I just install a new one copy Mac OS Sierra, but after that the keys on my keyboard don't work properly as some of the keys do not work yet at all. What can I do to solve this problem, and also if there is any software I can use to test the keys on the keyboard works properly or not

See if you have enabled mouse keys. Other users have reported that after update to Sierra

OS x: Impossible to type while mouse keys is enabled - Apple Support

Tags: Mac OS & System Software

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