How can I unlock the Numlok, permanently typing numbers and not allowing typing letters, in IBM laptop?

Please help to unlock the keyboard numlock or is it something wrong with the keyboard.... NumLk key is not responding.How can I unlock the Numlok, permanently typing numbers and not allowing typing letters, in IBM laptop?
If you have a number pad (to the right of the letters), ';Num Lock'; turns this pad from entering numbers, into using the arrow keys on the number pad.





It doesn't affect your ability to type letters from the keyboard.





Sounds like you might have a problem with the keyboard.How can I unlock the Numlok, permanently typing numbers and not allowing typing letters, in IBM laptop?
Find the Function key(';fn';),it's a blue colored key in the lower left corner of the keyboard. Hold it down and then press the numlock key.