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Home Computer Tutorials Troubleshooting Laptop keyboard not working but external one does

Laptop keyboard not working but external one does

Aug 02, 2025 am 11:39 AM
Keyboard failure 外接鍵盤

Check for physical or software locks like Fn key combinations or BIOS settings disabling the internal keyboard. 2. Restart the laptop without the external keyboard to rule out temporary glitches. 3. Update or reinstall keyboard drivers via Device Manager or download latest drivers from the manufacturer’s website. 4. Test the internal keyboard in Safe Mode to determine if third-party software is causing the issue. 5. Inspect for hardware problems such as debris, loose ribbon cables, or a failed keyboard module, which may require professional repair. 6. Boot from a live OS like Ubuntu; if the keyboard still doesn’t work, the issue is likely hardware-related. The problem is typically either a simple fix involving drivers or a function key, or a hardware failure requiring repair, not a systemic operating system issue.

Laptop keyboard not working but external one does

If your laptop keyboard isn’t working but an external one works fine, the issue is likely isolated to the built-in keyboard — not the operating system or core hardware. Here’s how to troubleshoot and potentially fix it.

Laptop keyboard not working but external one does

1. Check for Physical or Software Locks

Sometimes the built-in keyboard gets disabled accidentally.

  • Look for a function key (Fn) lock: Some laptops have a key combination like Fn F8, Fn F10, or Fn Esc that toggles the internal keyboard on/off. Try pressing it.
  • Check if the keyboard is disabled in BIOS/UEFI: Restart your laptop and enter BIOS (usually by pressing F2, Del, or Esc during boot). Look for a setting like "Internal Keyboard" or "Keyboard Enable" and make sure it’s turned on.

2. Restart and Check for Temporary Glitches

A simple reboot can resolve driver or system hiccups.

Laptop keyboard not working but external one does
  • Restart the laptop with the external keyboard disconnected.
  • After reboot, check if the internal keyboard works.
  • If it still doesn’t work, reconnect the external keyboard to continue troubleshooting.

3. Update or Reinstall Keyboard Drivers

Driver issues are a common cause.

On Windows:

Laptop keyboard not working but external one does
  1. Press Win X and select Device Manager.
  2. Expand Keyboards.
  3. Right-click on your internal keyboard (often labeled as "Standard PS/2 Keyboard" or similar).
  4. Choose Uninstall device → Confirm.
  5. Restart your laptop — Windows will reinstall the driver automatically.
  6. Test the internal keyboard.

Also, check for updates:

  • In Device Manager, right-click the keyboard → Update driver → Search automatically.
  • Or go to your laptop manufacturer’s website (e.g., Dell, HP, Lenovo) and download the latest keyboard or chipset drivers.

4. Test in Safe Mode

This helps determine if third-party software is interfering.

  • Boot into Safe Mode (hold Shift while clicking Restart, or use System Configuration).
  • Once in Safe Mode, unplug the external keyboard and test the built-in one.
  • If it works in Safe Mode, a background app or driver might be disabling it.

5. Check for Hardware Issues

If software fixes don’t help, the problem may be physical.

  • Spills or debris: If liquid was spilled or dust has built up, the keyboard may be damaged. Gently clean around the keys with compressed air.
  • Loose internal ribbon cable: Over time, the cable connecting the keyboard to the motherboard can come loose — especially if the laptop was recently opened or dropped.
    • This requires opening the laptop (check your model’s guide) or taking it to a repair shop.
  • Failed keyboard module: If the keyboard doesn’t respond at all and drivers aren’t the issue, the hardware may be dead.

6. Try a Live OS (Optional)

Boot from a Linux USB (like Ubuntu Live). If the internal keyboard doesn’t work there either, it’s almost certainly a hardware problem.


Bottom line:
If the external keyboard works, your OS is fine. Start with driver reinstall and function key checks. If those fail, suspect hardware — especially if the keyboard never responds, even at the BIOS screen. In that case, professional repair or replacement may be needed.

Basically, it's usually either a quick fix (driver or Fn lock) or a hardware issue — not a major system problem.

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