Early 2011 model, A1278 / 2.3 GHz i5 or 2.7 GHz i7 processor.

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Why key 1-9 on my key is not working?

after upgrade to sierra, key 1-9 isn't working. but when i use external keyboard, its working fine. please help me

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Could be a couple of things. Did you spill anything on it?

Boot into Safe Mode by holding down the shift key on boot up. If it now works, get a Paid anti-virus such as WebRoot or Symantec Endpoint Protection and get rid of your virus.

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