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Are you talking about the colored icons on the function keys such as the wireless, the brightness of the screen and the volume of speakers? If so, you have to Press and Hold the FN Function key at the lower left portion of the keyboard then hit the function key that you want.
Notice that the color of the FN key matches the color of the function you want on the function key. Anytime you see that, you have to Press and Hold the FN key.
Some systems might have the task with a square around it on the function key. In that case you would Press and Hold the key at the lower left portion of the keyboard that has the square on it.
FN (Function Key) that is usually located near the bottom left on the
keyboard is not a key that you press by itself to do anything. The FN
key works in combination with the (F1 thru F12) and any other key that
has the same symbol or color as the FN Key. You have to Press and HOLD
the FN key while pressing another key.
If the FN key is Blue and
for example your F8 key has a (white F8 on it and a Blue battery icon on
it) then to see your battery metor (how much charge it has left) you
would Press the FN and hold it then press the F8 key. The F8 that is
white does not require you to press the Blue FN.
Sometimes the FN
key might have a white square on it, then the keys that work with the
FN key will also have a symbol with a white square around it.
There are a couple of reasons that a laptop screen could blank our. The first is that many laptops have the ability to output video to an external monitor or projector, such as for video presentations. In order to save battery life, there is a function key combination that can be used to blank the laptop screen. Most laptops have these "functions" on the F1-F12 keys in blue and there is an "fn" key that must be used with them to activate the function. Look for a key that has a blue "square" with vertical lines on either side of it. This is the Monitor function key. Press and hole the "fn" key, then press the Monitor function key. See if the screen returns. A corrupted video driver could also be the problem. Do you have any display when booting up? If so, try using the F8 key to get to SAFE Mode. If you have a display there, check and see if there are any problems with the video driver, or just reload the driver. The third possibility is the the LCD's backlighting source may have failed. IF this is the case, you probably have an older laptop and replacement is usually cheaper and more cost effective than repair.
If this is hardware problem, it'd be hard to repair. I don't mean it's not repairable, but what i mean is i don't recommend since repairing a keyboard and purchasing a new item will cost you more or less the same.
Well try this, Press Fn + Numlock (simultaneously on both the keys) on the keyboard and check if it helps or not [press once and then type the malfunction keys, if not press twice or thrice]. Most keyboard with Fn key's functions can be deactivated or activated with this key combination.
but if you want to use tha additional features of function key like save, load, close and many more then you can get the software directly from official website of sony. alternativel you can download hotkeycontrol xp by which you can reconfigure you keyboard to add extra feature and options
As far I know FN keys are related with specific motherboard drivers.
Thoshiba recovery cd/dvd during restore/re-install, loads all toshiba drivers and utilities for operating fn keys.
If the operative system loaded in the laptop is no OEM then you will have this problem, and in order to fix it you must:
First install the operative system (clean install)
Second install: chipset drivers. This drivers instructs the operative system how to detect specific hardware. Must be installed in first order.
Third: install drivers (ethernet card, audio, video controller, toshiba utilities, etc). At this point verify all FN keys ( check display settings, stand by/ hybernation, etc).
four: Load all software needed (microsoft office, etc).
Your keyboard may have a function key lock (could be up in the right corner) that locks the keys in the Fn mode. Look for that. I have seen this on several keyboards. On some keyboards I've been able to get around this by hitting the print screen, scroll lock, or pause key to unlock it.
your keyboard driver may be corrupt, go to my computer, right click>properties>hardware tab>device manager and go down list to keyboards, click '+' sign, right click on your keyboard and select uninstal.
Restart your notebook and the keyboard and drivers will be reinstalled automatically and should be as normal, but check for any updated drivers at Sony:-