Help

Try wiggling the keyboard cable connected to your computer; it might help. Also, it's possible that a circuit underneath the keys has burned out. After all, if my memory serves me correctly, a keyboard is structured like a computer with block diagrams, so it's quite possible that one circuit burned out, but the rest will continue to work as if nothing happened. Check it out; borrow a keyboard from a friend for an hour and plug it into your computer. If everything works, then the problem is with your keyboard.