In my Elitebook 850, keys Y, U, H, J, N and M, do not work. How can I repair this?

[LuisCaballero]

The rest of keys work perfectly. It´s only these 6 ones.

And it started happening suddenly, wihtout any apparent reason.

[Gudrun567]

If specific keys on your EliteBook 850 aren't working, start by cleaning the keyboard for debris and then update or reinstall the keyboard drivers through Device Manager. Performing a hard reset might also help. If the issue persists, professional repair or replacement may be needed.

[LuisCaballero]

Thanks for your quick response, Gudrun.

How could I perform a hard reset?

[LuisCaballero]

I´ve just checked that the battery is ok. Anyway, it is not closed to the keys.

Thanks a lot, anyway, Dragon.

[LuisCaballero · Accepted solution]

Finally I have replaced the keyboard with a new one.

For this model of laptop, it is easy to do it.

Thanks to all