I have an ASUS X52N laptop. The keyboard does not function the same, as my cat jumped on it and did something. My keys do not respond as quickly and if I need to repeat a letter, I have to pause and wait. The same with backspace to erase, pause and wait and erase one lettler at a time very slowly. I looked at the keyboard rate settings, they have not changed. I do not know what the CAT DID! I feel like a fool!

SOURCE: Asus w2v laptop keyboard problem

Press Fn + Numlock. You have the number lock on, but laptops don't have a number pad. So it re-assigns these keys to overlay some existing ones. Once your number lock is turned off you should be ok.

SOURCE: keyboard problem - asus

it seems to me that you have the NumLk activated, deactivate it by pressing Fn + NumLk, hope this works!

SOURCE: ASUS keyboard delete key won't work

are you sure that the key is seated properly on the board? This can easily be fixed by popping it off and checking to see if the 1, or 2, plastic like springs are connect to the key and the board.

SOURCE: my asus laptop wireless switch does not work

well you erased the drivers for the fn keys and the wireless go to the manufacturer website and type the model of if possible laptop or motherboard and download the drivers for wireless and media controls

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SOURCE: H KEY constantly repeats as if it is stuck

May be there is mechanical problem of ur keyboard.Please repair it via this guide :
http://www.laptoprepair101.com/laptop/2007/03/20/key-fell-off-keyboard/