The Caps Lock key not working can usually be fixed through hardware checks, software settings, registry edits, or third-party tools. First, check for physical issues like debris or damage and try an external keyboard. Next, verify keyboard settings on your OS—disable Toggle or Filter Keys on Windows and check modifier key assignments on macOS. For Windows users, consider a registry fix by removing the Scancode Map entry if present. Finally, use tools like SharpKeys (Windows) or Karabiner-Elements (macOS) to remap or restore Caps Lock functionality if needed.

If your Caps Lock key isn't working, it can be a real nuisance — especially when you're trying to type passwords or make specific text stand out. The good news is, the issue is often fixable without needing a new keyboard.

Check for Physical Issues First

Before diving into software fixes, make sure the problem isn’t with the hardware itself. Sometimes dust, debris, or a stuck key can prevent Caps Lock from functioning properly.

• Tap or press the key a few times gently to see if it gets unstuck.
• Try using an external keyboard if you're on a laptop — if the external one works fine, your built-in keyboard might need cleaning or repair.
• Look for any physical damage around the key or signs of spills.

If everything looks normal and the issue persists, move on to checking settings or software conflicts.

Verify Keyboard Settings in Your OS

Sometimes the Caps Lock behavior changes due to system settings or accessibility features.

On Windows:

1. Go to Settings > Ease of Access > Keyboard.
2. Make sure Toggle Keys or Filter Keys aren’t enabled — these can interfere with how modifier keys behave.
3. Also check if Caps Lock is remapped under any keyboard layout settings or third-party apps.

On macOS:

1. Open System Settings (or Preferences).
2. Go to Keyboard, then Modifier Keys.
3. Ensure that the Caps Lock key hasn’t been reassigned to another function like Control or Command.

You can also use the On-Screen Keyboard (Windows) or Keyboard Viewer (macOS) to see if pressing Caps Lock registers visually.

Try a Registry Fix (Windows Only)

If the key seems unresponsive but your keyboard works fine otherwise, there’s a known tweak involving the Windows Registry that sometimes helps:

• Press Win R, type regedit, and hit Enter.
• Navigate to:
  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout
• Look for a value called Scancode Map. If it exists, it may be remapping your keys incorrectly.
• You can delete this entry (back up the registry first!) and restart your computer.

This fix usually applies when Caps Lock has been disabled by malware or a misbehaving app.

Use Third-Party Tools as a Workaround

If nothing else works and you still need Caps Lock functionality, consider tools like:

• SharpKeys (Windows): Lets you remap keys easily through a simple interface.
• Karabiner-Elements (macOS): A powerful tool to customize key behaviors, including restoring Caps Lock if it's been hijacked.

These tools are great for both diagnosing and fixing issues where Caps Lock is being blocked or reassigned.

That’s about it. Most of the time, the problem is either a quick settings tweak or a temporary hardware hiccup. If none of these help and the key remains completely dead, it might be time to look at replacing the keyboard or getting it checked by a technician.

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