I have a key with a square with Fn in it which works different functions but it is stuck - ie if i want to type an "i" it will type 5 (5 being the secondary function of the key - again displayed in a square)
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On a laptop, the "Num Lock" key has a function slightly different than the one it performs on full-d desktop keyboards. Activating "Num Lock" on a laptop usually transforms a set of central keys, including many letters, into number keys, allowing typists used to entering numbers on a keypad to type efficiently. While on desktop keyboards "Num Lock" usually has a dedicated key, on laptops it often shares a key with another function on MacBooks, for example, it shares the "F6" key and you must hold down the "Shift" or "Fn" key to activate it.
Look for the "Num Lock" key on your laptop's keyboard. This is usually near the top of the keyboard. If the key says nothing on it except "Num Lock" if that's the only function the key performs you can just press it to activate the lock; a light will probably go on somewhere to indicate that "Num Lock" is on. If the key has multiple functions, you'll have to hold down a different key while pressing it. Hold down "Shift" and press "Num Lock" if the writing saying "Num Lock" appears above some other writing on the key, the way various symbols appear above the numbers on the keyboard's number row. Hold down "Fn" and press "Num Lock" if the writing saying "Num Lock" appears in a different color often light blue that's shared by the "Fn" key.
On the Panasonic Toughbook CF-51 there is a key located on the top right next to the F12 function key called "NumLk" or Num Lock.
Press this key once and the embedded numeric keypad is enabled.
Press it a second time and it is disabled.
How do you know if it is enabled or disabled?
Simple: Observe the LED above the keyboard. If the second light with the square symbol and the number "1" is lit up, then the NumLock is enabled. If that LED is not lit up it is disabled.
From Richard, Montreal Based Panasonic Canada Authorized Toughbook Dealer since 1989.
You need to find the special function key that, when used with the Fn key, locks the Fn function on. On my keyboard it's the F11 key. Press the Fn key and that key and your keyboard will return to normal.