WKB-3510 UB keyboard having trouble with numbers on the right hand side of key board the letters won't work unless you are holding down the fn key on the left side just under the shift key

SOURCE: Panasonic Toughbook CF-51 laptop blue FN key locked on

Hit "FN" and the "NUM Lock" key together to unlock it.

I believe thats the combination.

Let me know.

SOURCE: function keys

Hi you need to hold down the function key (FN) and press the number lock key (num lk). hope this helps

SOURCE: acer aspire 3003wcli keyboard stopped responding

You probably activated the "Num Lock" accidently. Just hold down the FN and look for the key that says "num lock" Now you should have your keyboard back and the numbers will just type when you hit the numbers key. I did this to myself yesterday!

SOURCE: Keyboard stuck in Fn mode

had the same prob on my laptop which doesn't have a seperate number pad so all I needed to do was to press "Num lock".

SOURCE: cannot use letters of my laptop unless use fn key but not capital

You need to press the NumLock key to get the keyboard to get back to alphanumeric - it has a symbol of a lock with a number 1 on it. A LED should also go out/icon in your tool tray should disappear as well.