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Why is my internal keyboard not recognized on startup?

Hi everybody!I have got a problem with my MacBook Pro. So the problem is when I power my MB on I can not perform any command I mean select the boot drive pressing alt(option) performing SMC, NVRAM reset actually nothing. But after it reaches the login screen every key works fine i can enter my password everything works okay.Somebody can help me please?

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Run a “Paid For” antivirus program like Symantec Endpoint Protection.

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Do you have access to a USB keyboard? You’ll need to give it a try.

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I tried it with wired and with wireless keyboard ...same results.

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Something just doesn't add up here. Was this an Apple USB keyboard or something else?

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It was a Dell wired Keyboard!

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See if an Apple USB keyboard works. Sometimes other party keyboards don't always react in the same way.

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Alexander 将永远感激不已
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