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.
Sounds like yo have the scroll lock or num lock turned on. If the scroll key is a colored key (the scroll lk lettering is blue) then you will have to Press and Hold the FN function key at the lower left portion of the keyboard then hit the scroll key to turn it off. When it is turned on if you press the letter i you get the number 5. If you press the letter O you get the number 6.
Notice that the numbers on the keys that have letters are a different color than the letters (blue most times). That means you have to Press and Hold the blue FN function key at the lower left portion of the keyboard then hit the key with the same color if you want the colored representation to happen.
Some laptops will use a Square Box instead of the blue colors on the keys. In that case you have to press and hold the key a the lower left portion of the keyboard that has the square box, then hit the key you want.
there must be an function key on your keyboard.....and several symbols on other keys ...with same colour may be...if you press function(fn)key + the key on which symbol is made the same task is done....for example a key on your keyboard has a crescent moon type symbol...if you use it with function key..your lappy will hibernate...some other keys may be for brigthness of your screen ,increasing and decreasing sound etc..