The right half of my keyboard (L, O, 9, f9, and all other keys to the right) don't work. The only exceptions to this problem are the ']' key. Also, the only keys that don't work on the num-pad are 0456 and delete. The problem surfaced after I took my laptop apart to clean the fan, but once i reassembled the laptop, those keys didn't work. I know I must have put something back wrong, but I don't know how to fix the problem. I use a HP Pavilion 17-e017dx and am currently typing with an external keyboard.any help would be greatly appreciated.