You got a new computer or perhaps just a new keyboard and now none of your function keys work.
Solution
Check to see if your keyboard has an F-Lock key. It's usually in the upper left or upper right area of the keyboard in the general area of the Function keys. Press it once, then try using the Function keys again.
Jason Tsang has a detailed explanation of how the new F-Lock key works (for you or against you) and even some tricks for forcing it to work the way YOU want it to. Visit Jason Tsang's FLock page
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