Shift "m" is not working

I'm using HP AY503TX notebook and Zorin OS 16. When I'm typing 'Shift+m', nothing is being typed. In all other keys when I type Shift+ that letter then it is typed as the upper case of the letter. But in the case of letter "m", it is not being typed anything at all. But if I am using Capslock and then "m', then it is working fine. Please help me to overcome this issue.

What settings do you have for Language and Lcoale?