Hello... Well my problem is that my FN key is not working and also my Function keys are not working...i tried to change my settings Just by going to Control Panel -> Hardware and Sound -> Adjust commonly used mobility settings -> Fn Key Behavior but i realised that there is not a Fn Key behavior ...

Are you pressing the 'Fn' key (usually blue lettering) to the left of the space bar before trying the function key for brightness?

Laptop function keys are either set to function as regular function keys or as system specific function keys, like volume and brightness control, when the system starts up. When you hold the Fn key, it makes that key do 'the other' function. These settings can be changed in the BIOS, of EFI settings. Though changing them is easy, you may want a semi-tech-savy friend to help the first time.

All the best to you,
KerryHos

Did you try just pressing them without Fn or try pressing them with Alt key, and if not working:
go to Start
type in Function keys and click on Function keys
check the checkbox
you're done!!

Hope this has helped you, glad to help!!

If there is a key on your keyboard that has the Fn key inside a lock icon, press Fn and that key and see if that unlocks the Fn key. You can also try pressing it normally, since your Fn key seems to have its own Fn-lock kind of setting.

If you dont have that kind of a key on your keyboard, this could be caused by an option in the BIOS. When booting up press the F2 key or whichever key your computer uses to open the BIOS. Once in the BIOS, look for an option that allows you to change the Fn key from a hotkey to something else, such as legacy.

The default behaviour of the Fn Key of Dell Inspiron n5010 is as Multimedia Controls, which can be changed from the BIOS by setting the behaviour of the FN Key as Function.
To do so: -
1. Restart the laptop and Press F2 to enter into BIOS Settings.
2. Locate Fn Key option and set it for Functions


Hope it helps! Good Luck!
CreativeTECH

The uses for the function (f1-f12) keys varies based on which program you have open at the time. Different programs use them for different things.

However, your computer also has some default uses for these keys when combined with pressing the fn (function) key.

fn + f1 locks computer

fn + f2 changes our power use profile

fn + f3 puts the computer to sleep

fn + f4 puts the computer into hibernation mode

fn + f5 changes the display/output mode

fn + f6 decreases the screen brightness

fn + f7 increases the screen brightness

fn + f8 enables/disables wireless connections

fn + f9 enables/disables the touch pad

fn + f10 turns the cursor overlay on/off

fn + f11 turns the numeric overlay on/off

fn + f12 turns scroll lock on/off

The fn key is the function key. I am sure that helps a ton. The fn key works like a shift key, changing the buttons marked fn, like volume, screen brightness, etc. The use is that you press and hold the function key, and press teh function button and then release both.
Common uses are to turn off the mousepad, while typing, and to set screen brightness while under battery....

Dear Friend,
Have you try another combination of function key?, if it doesn't work it means that the touch pad FN key is missing and can be re-install by going to the Asus download web-page:
http://support.asus.com/download/download.aspx?SLanguage=en-us
and select your model number as well as the operating system.

Good Luck!

IT IS USED FOR SETTING SOME CHANGES IN YOUR COMPUTER, E.G CHANGING THE BRIGHTNESS, ADUJSTING THE VOLUME, TRANSFERING THE LAPTOP SCREEN TO MONITOR(EXTERNAL).... IF YOU HAD SEEN FN KEY..THEN YOU ALSO CAN SEE THAT KEYS FROM F1-F10, THERES SMALL SYMBOLS WHICH FN KEYS ARE ABLE TO FUNCTION..TRY IT

There is a master function key that you hold down while tapping another function located on the keyboard. This all depends on the model of laptop. Next time try to giva a little more info like make and model, which is located on the bottom. The function key or Fn key is usually located on the keyboard near the Alt and Control key lower left. while holding this key down, you tap the corresponding brightness key on the number of the keyboard, some times the brightness is on the 4 arrows on the right side of the keyboard...sometimes they are the numbers 6 or 7 look for what appears to be a symbol that looks like the sun or a light. Hold down Fn and tap the key that brightens the display.

Hello,
There is no driver required to use the function keys. You just need to use the function (fn) like a shift key. Hold the function (fn) key and then press the according function key.