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

[bagdasarov.sasha]

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

 

[kindangrysliceofpie]

Did you spill any liquid inside it? Static discharge possibly?

 

[bagdasarov.sasha]

Did you spill any liquid inside it? Static discharge possibly?

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