This problem is solved by pressing "fn" and "num lk scroll" keys down together, not "Caps lock" instead of "fn". Try both, you will see. I gues S/he was pressing the keys ramdomly and the problem got solved un aware!! the light next to the "num lk scroll" should be off for the keyboard to work normally. If the light is "on" then the "fn" key is active and locks the functions on the keys eg. "U" becomes "4" instead coz there are on the same key. I>5, O>6 and so on. those sre the chracters that are circled on the same key. to enable and disable those characters, do as mensioned above.