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I will assume this is a laptop. Usually there is a key 'Fn' which stands for Function. Press this key and at the same time (immediately after) press the key that turns on the keyboard lights. Laptops often have keys with dual functions. The secondary function will be printed in a different color ink than normal. This us usually blue or red but can be any color. Holding the 'Fn' key while pressing one of these will access its secondary function such as volume control, sleep mode, keyboard lights, numbers, screen brightness, and so on.
Usually either one of the function keys will have a secondary label or maybe the scrlk key (mine Lenovo). Then look for a key labelled either "function" or "FN". Press that key and then the key labelled numlock and that will revert your keyboard.
OK, you are part right. The Fn key on most laptops is written in BLUE. This corresponds to the BLUE legends on various keys on the keyboard. MOST laptops have a pair of generic symbols for the screen brightness up and down . The brightness UP is a blue square (rectangle) with a large asterisk inside. The brightness DOWN is the same except it has a small asterisk inside. You will usually find these two keys as a secondary function of a function key.
Example: On my ACER netbook Fn+F6 = brightness UP and Fn+F5 = brightness DOWN
If you are talking about the number symbols that are on keys
U,I,O,P,J,K,L,M then notice what color the number symbols are on those
keys. Normally they are blue or might have a square around them. That
means you have to press and hold the key that is the same color or has
the square around it on the left side of the keyboard. Normally you
would Press and Hold the FN function key at the lower left hand portion
of the keyboard, then hit the key for the number you want. Notice that
the FN function key will be the same color as the numbers. If it's not
the FN function key then it will be the key that has the square around
it like the numbers has.
Have you tried using the function keys? There is a row of keys at the top labeled F1 though F12, they also have symbols. Find the one that looks like one of these, press and hold the function enable key that is like at the bottom of your keyboard and then select the button you found in the top row.
The function button, or FN button, is used just like the shift key or ctrl key. Hold the FN button down and press the key with the pre programmed function you desire to use. For instance, on an HP 1245 the function or short cut key to put the computer in sleep mode is FN+F5. The Keys with functions have that feature indicated by a symbol for the function in a squared circle. Most of these are your F keys at the very top row of the keyboard. Some are on the number pad keys.
On notebooks you have to hold the function key to access the secondary functions of various keys. The function key usualy has the symbol "Fn" and is three spaces to the left of the space bar. Hold that down and then press the "prt sc" button.
Is it giving you numbers and symbols?
Press and hold the function key fn while pressing the num lock key num lk .
This will deactivate the integrated keyboard/numeric keypad, and the keys will respond normally.
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