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Try blowing out the area with a can of dust buster. Sometimes you have to carefully pull the key off and see if a piece of particle fell under it. It usually snaps back into place but pull it off carefully.
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If you mean the Fn key - then you have to go to a repairman. If you mean F1 to F12, then press & hold Fn and press the F1 to F12 depending on what you need to acomplish.
Function Keys can be unlocked by using combination of Function (FN) key and any other key. Generally they are the F keys right on the top from F1 to F12.
Most often the following combinations work:
1) Fn + F6 2) Fn + Num Lock 3) Holding Fn for a while 4) Fn + F8 5) Ctrl + Fn 6) Shift + Fn
Please, all most at all times the function keys from F1 to F12 are marked and indicated about what they do. The marking is pointed by a small icon just under the name of the Function key.
FN+ F buttons are used as a shortcut. For example, in my laptop, F1 button has a ? icone at the bottom. when a pres Fn+F1, it will launch the help program. F1 to F12 buttons have different shortcuts.
Packard Bell Easy Note E2 ---- Fn / F1 Packard Bell: easy-note MV46/008 ---- Fn / F1 Packard Bell MZ36-U024 ---- Fn / F2 Easy note W7730---- Antenna like wireless button on the side of the laptop.
(Press & Hold Fn Key and Press F2 or F1 key) ... :)
Try this;
Press Fn+F1 instead of F1 alone or Fn+\F2 not only F2. Most laptops are by default Fn key activated so we always need to press it with the key combination.
If this doesn't help, there must be internal faulty/problem. Boot up the system and keep pressing F8 and go into "Advanced Boot options", if it's working, then there's no hardware, must be the Fn key.
Good luck
Have you tried "Delete" to enter the "Bios Settings"? If not this must be the shortcut for your laptop, since most compaqs' Bios settings are accessed with "del" key. Actually for Hp compaq laptops, F1, F2, F10 and Delete keys are the shortcuts. (varies with series/models).
If this doesn't help, try Fn+F1, Fn+F2, Fn+F10 etc..
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