Key board not working on my Acer Aspire laptop

Jan 21, 2019
Hello, I have an Acer Aspire E15 and my keyboard suddenly stopped working. If i connect external keyboard, everything works fine. I tried uninstall keyboard driver, but it didnt help. Power button key works (it looks like it is part of keyboard but i guess it is not). Is still possible that its not a hardware problem?

figure out that not all but few (f6 yes, f8 no ..?) combinations of fn + "turn off screen key etc." also works