Chosen Solution
I installed a new hard drive and when I tried to installed the OS x, some of the letters on the keyboard were not responding. Does $#@&&! to do with the fact that maybe I connected the board incorrectly ?
Sure. Just lift the keyboard and look in the socket (male and female) to see if they’re is clean and then reseat it. You don’t even need to screw the keyboard in to test it. A little tape helps hold it in place.
I find it helps just to remove the battery then put back in again and reboot the computer.
