You are not able to enter any input from your keyboard?
If you are not able to enter any input from your keyboard, check
to see if your keyboard is locked. If it is, simply press the F
lock key to unlock the keyboard. Also check to see if the number
lock is on and press that as well. This should restore proper
functionality to your keyboard. If it still does not work after
these methods, try unplugging it from the PC. You can then restart
the computer and check to see if it works. If it does not, you will
need to take it in for repairs.