Some keys and aux jack of notebook doesn't work. Why?

Sep 11, 2018
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Notebook keys and aux jack stopped working. After some moment it just stopped working.
These buttons are bottom arrow keys, letter B, N. ? symbol. and also it's aux jack.
Model of the notebook is Lenovo B50-70
 
Sep 11, 2018
2
0
10
0


Absolutely no! It just worked okay, and then stopped working.
Static discharge?
 
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