identify the problem

A laptop typically has two Fn keys, Fn1 and Fn2. The Fn1 key is usually located in the bottom left corner of the keyboard, and the Fn2 key is usually located in the bottom right corner. On some laptops, the Fn key is replaced by an “Application” key that performs the same function. If your Fn key is locked, it may be because you have accidentally pressed the Fn + Num Lock or Fn + F12 keys on your keyboard.

the fn key is locked

If your FN key is locked, it means that you won’t be able to use any of the special functions on your keyboard. This includes the brightness, volume,and media control keys. To unlock your FN key, you’ll need to hold down the key and then press the ESC key.

how to we solve the problem

If your fn key is locked, it’s usually because you’ve pressed the fn key + f11 key, which will enable/disable the fn lock. To solve the problem, just press the fn key + f11 key again to disable the fn lock.

go to system Preferences

Go to system Preferences select Keyboard check the box that says “Use all F1, F2 etc keys”

click on Keyboard

First, try restarting your computer. This is often the simplest way to fix problems with your keyboard.

If that doesn’t work, you can try:

• Adjusting the keyboard settings in your operating system
• Connecting a different keyboard to your computer
• Checking for hardware issues (including spilled liquids)
• Updating or reinstalling your keyboard driver
  click on Modifier Keys
  
  Click on the “ModifierKeys” button. It’s the button with a picture of a keyboard in the Utility Manager window. Doing so opens a new window.

Click the check box to the left of “caps lock.” Alternatively, you can click on the drop-down menu to the right of “caps lock” and select “toogle.”

Click on “ok.” Doing so applies your changes.

change the fn key to “Function keys”

You can change the function of the Fn keys to perform “media” actions by default, or “function” actions by default. This is handy if you use the Fn keys a lot, as it means you don’t have to hold down Fn every time.

To do this, open the System Settings and select Keyboard from the Hardware section. Click on the Layout tab and make sure that there is a checkmark next to Enable Key Sequence Shorthands. Now, click on the Options button next to Function Keys and select Function Keys in the drop-down menu.