Why is there no fn key?
This keyboard, the one with the keys enclosed at sides and bottom with clear plastic, has no fn key. What can I do?
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What he's saying is there is no Fn key on that keyboard at all - it isn't there, it doesn't exist.
The only option you have, assuming you're using OS X, is go to System Preferences, Keyboard and check the box that says "Use F1, F2, etc. as standard function keys". Note that this means F1, F2 etc won't work with any apps that use them for input.
FYI you can't remap the Fn key in the OS because holding the Fn key and pressing another key sends a distinct signal that's equivalent to pressing a different key - the same as pressing J vs K. So it's like having a bunch of extra keys that you don't actually have access to. The Fn key itself doesn't send a signal to the OS as normal keys do.
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If you are desperate, there is a fn key in the keyboard viewer.
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Can you clarify what you mean here. Did you loose the key cap or is the key just not working.
par Dan
There is no Fn key on a A1048 keyboard
par kevin
Some or all of the newer Apple keyboards have a 'fn' key in the block of 6 keys that include 'home', 'end', 'page up' and 'page down'. On older keyboards you could try holding down the 'control' key as you press a function key and if that doesn't work click on the Apple, top left, 'System Preferences', 'Keyboard' and then 'Modifier Keys ...'. At the bottom of the list it should have 'Function (fn) Key' and you can choose one of 5 alternatives, including 'Control'. You may have to try different ones to verify that assigning a specific key to serve as 'fn' doesn't have undesirable effects on keys other than the function keys.
par D. Spencer