Windows 10 Function Keys Not Working: Getting F1 to F12 to Do What You Expect

You press F5 to refresh a web page, and instead the screen brightness drops. Or F2 to rename a file does nothing at all. When Windows 10 function keys not working behave like this, shortcuts slot dewa you rely on stop responding.

Most laptops give the top row two jobs: standard F1 to F12 keys and media or hardware controls such as volume, brightness, and Wi-Fi. A setting called Fn Lock, or “action keys mode,” decides which job comes first.

If the media functions take priority, you have to hold Fn to get F1 to F12. Missing hotkey drivers can also make the media functions stop working.

The problem often shows up after buying a new laptop, after a BIOS update, or after reinstalling Windows, when the default setting changes without notice.

What Might Be Causing It

Function keys misbehave for these reasons:

• Fn Lock or action keys mode is set to media functions.
• The manufacturer’s hotkey driver or utility is missing.
• A BIOS setting controls the function key behaviour.
• A keyboard driver or physical fault affects the top row.

Desktop keyboards with an F-Lock key work in a similar way.

On some laptops, the media functions themselves stop working, so volume and brightness keys do nothing even with Fn held. That points to a missing hotkey driver rather than the Fn Lock setting.

First Steps to Try

Switch the Fn Lock mode.

1. Hold Fn and press F5 to test whether the standard function works.
2. Look for an Fn Lock key, often marked with a padlock, or try Fn + Esc.
3. Press it once and test F5 again without holding Fn.
4. On desktop keyboards, press the F-Lock key if present.
5. Restart the PC.

If holding Fn works, the keys are fine and only the mode needs changing.

Some keyboards show a small light on the Fn Lock or Esc key when the lock is active, which tells you at a glance which mode is in use.

If the Problem Continues

Check software and BIOS.

1. Open the manufacturer’s utility, such as Lenovo Vantage, HP’s system app, or Dell’s keyboard settings, and look for function key behaviour.
2. Enter the BIOS and look for “Action Keys Mode,” “Function Key Behavior,” or “Hotkey Mode.”
3. Install the hotkey or keyboard driver for your model.
4. Update the BIOS if hotkey fixes are listed.
5. Test with an external keyboard.

If the keys work in the BIOS but not in Windows, the problem is a Windows driver or utility rather than the keyboard hardware.

Protect Your Data First

Change only function key settings in the BIOS. BIOS updates must be done on mains power and must not be interrupted.

The Bottom Line

Function keys usually need Fn Lock or action keys mode changed. Toggle Fn Lock, check the BIOS, and install hotkey drivers.

After fixing the keys, test both F1 to F12 and the media functions so you know exactly which combination now does what.