Cool. Thank you I understood mostly everything ; ) I think my keyboard is a Membrane one. ; )
You know I never spill liquids and the flex cord is short, very closed to the motherboard, so there were no chance for me to move it. So I think in general the keyboard must have reached its cycle of life.
Thank you everybody for your replies , i am going to install Zorin 16.1 today - Though i preferred to install 16 but cannot find the file in the download official web site - P.S. if you guys could take a look at this post Is this disk Ok for instalation? I will be thankful.