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Maybe this is the result of inadvertently turning on "Sticky keys" (see the Accessibility Control Panel Help file). Try holding the Fn key down for several seconds with no other key pressed to see if that turns off the Fn lock-on. After that you can disable the Sticky Keys function in Accessibility.
Just like a shift key selects the upper case character for a key, the fn key selects whatever is printed on the other keys in the same color used for the letters "fn." You would hold down the fn key, then press the key labeled with the desired secondary function, and let go of both keys.
F1 through F12 are called function keys because they execute programmed functions when pressed. Used in combination with the Fn key, keys marked with icons execute specific functions on the computer. The function executed by individual keys depends on the software you are using.
1. Sound Mute: Pressing Fn + ESC in a windows environment turns sound on or off. Press Fn + Enter to simulate Enter or the enhanced keyboard's numeric keypad. 2. Instant security: Press Fn + F1 to blank the screen to prevent others from accessing your data. To restore the screen and original setting, press any key or press the Touch Pad. 3. Power save mode: Pressing Fn + F2 changes the power save mode. 4. Standby: When you press Fn + F3, the computer enters Standby. 5. Hibernation: When you press Fn + F4, the computer enters Hibernation. 6. Display selection: Press Fn + F5 to change the active display device. Hold down Fn and press F5 again to change the device. 7. Internal LCD screen Brightness: Pressing Fn + F6 decreases the display brightness in decrements. 8. Internal LCD screen Brightness: Pressing Fn + F7 increases the display brightness in increments. 9. Wireless setting: If your computer has both Bluetooth and Wireless LAN functions, you can press Fn + F8 to select which type of wireless communication you want to use. 10. Touch Pad: Pressing Fn + F9 in a windows environment enables or disables the Touch Pad function. 11. Press Fn + F10 or Fn + F11 to access the integrated keypad. When activated, the keys with gray markings on the bottom edge become numeric keypad keys (Fn + F11) or cursor control keys (Fn + F10). The power on default for both settings is off. Press Fn + F12 (ScrLock) to lock the cursor on a specific line. The power on default is off. 12. TOSHIBA Zooming Utility (reduce): To reduce the icon size on the desktop or the application window, press the 1 key while holding down the Fn key. (13. TOSHIBA Zooming Utility (enlarge): To enlarge the icon size on the desktop or the application window, press the 2 key while holding down the Fn key.
You need to find the special function key that, when used with the Fn key, locks the Fn function on. On my keyboard it's the F11 key. Press the Fn key and that key and your keyboard will return to normal.
Try holding down the function key and hitting the numlock or scroll lock key, this is usually how you engage or disengage the laptops function keys on the keyboard. Most laptops have a light that will turn on and off when you do this, indicating that the funtion keys are in use.
you need to reload that software that came with the keyboard. Uninstall the keyboard from device manager :- Control Panel>system>device manager. Then reload the software for the keyboard, which should also have the drivers. If you do not have the software, let me know the make and model of the keyboard and I will see what I can do.
(FuNction key) A keyboard key that works like a shift key to activate the second function on a dual-purpose key, typically found on laptops to reduce keyboard size. It is different than the function keys F1, F2, etc. It is also a real nuisance when the PageUp and PageDn keys are placed on the Up and Down Arrow keys and have to be activated by pressing the Fn key.