Laptop keyboards fail differently from desktop ones. There is no cable to reseat, the keys are harder to clean, and function keys double as media and brightness controls. The good news is that the fix is usually in settings or a driver, and a two-minute BIOS test tells you for certain whether the hardware is at fault.
Start with the tester
Press the dead keys in the tester above.
| What happens | What it means |
|---|---|
| The key registers | Hardware is fine. A setting, app or remap is ignoring it. |
| Nothing registers for that key | The signal is not reaching Windows or macOS. Driver or hardware. |
| Letters type numbers | Num Lock overlay is on. Fix 1 below. |
| Function keys do media things | Fn lock. Fix 2 below. |
| Random keys across the board | Driver, liquid damage or a failing ribbon cable. Fixes 5 to 8. |
Fix 1: Num Lock overlay
Many laptops hide a numeric keypad on the right side of the letter block. When Num Lock is on, U, I, O become 4, 5, 6 and so on. Press Fn+Num Lock, or Fn+F11 on many HP and Lenovo models, or Fn+Insert on some ThinkPads, and type again. Keyboard typing symbols or numbers instead of letters covers every variant.
Fix 2: Fn lock
If F1 to F12 adjust volume and brightness instead of doing their normal jobs, or the other way round, the Fn lock is toggled. Press Fn+Esc on most laptops (the Esc key often has a small padlock icon). On Macs, the behavior is a setting: System Settings → Keyboard → Keyboard Shortcuts → Function Keys. See Function keys not working.
Fix 3: Filter Keys and Sticky Keys
These accessibility features ignore short presses or hold modifiers. They turn on by accident: eight seconds on the right Shift for Filter Keys, five taps of Shift for Sticky Keys.
- Windows: Settings → Accessibility → Keyboard. Turn both off.
- Mac: System Settings → Accessibility → Keyboard. Turn off Slow Keys and Sticky Keys.
Fix 4: Check the layout and language
Press Win+Space to see the active keyboard layout. A wrong layout makes keys type the wrong characters rather than nothing, but it is worth ruling out. Remove layouts you do not use under Settings → Time & Language → Language & region.
Fix 5: Reinstall the keyboard driver (Windows)
- Right-click Start → Device Manager.
- Expand Keyboards. You may see more than one entry; the built-in keyboard is usually “Standard PS/2 Keyboard” or “HID Keyboard Device”.
- Right-click each, choose Uninstall device, then restart.
Windows reinstalls the driver on boot. If the keyboard stopped after an update, open the device’s Properties → Driver → Roll Back Driver instead.
Fix 6: Power reset
A full power cycle clears controller faults that a normal restart does not.
- Shut down completely (not sleep).
- Unplug the charger. If the battery is removable, take it out.
- Hold the power button for 15 to 30 seconds.
- Reconnect power and start up.
On a Mac with Apple silicon, a shutdown and restart does the same job. On Intel Macs, resetting the SMC helps with keyboard and power issues: shut down, then hold Shift+Control+Option on the left side plus the power button for 10 seconds.
Fix 7: Test in BIOS or UEFI
This is the decisive test. Restart the laptop and repeatedly press the setup key as it boots: F2 (Dell, Asus, Acer, Lenovo), F10 (HP), F1 (some ThinkPads), or Delete. In the setup screen, try the arrow keys and type in any text field.
- Keys work in BIOS: the hardware is good. The problem is Windows, its drivers, or software. Go back through fixes 3 to 5 and consider a malware scan and a clean boot.
- Keys fail in BIOS: the keyboard, its ribbon cable or the controller has a fault. Go to fix 8.
Macs have no BIOS screen, but you can test the keyboard at the login window after a restart, before any software loads, or in Recovery mode (hold the power button on Apple silicon).
Fix 8: Hardware
- Clean. Power off, blow compressed air at an angle between the keys, tilt and tap. Laptop keycaps can be lifted from the top edge, but only if you know your model’s hinge; see One key not working.
- Liquid. If anything was spilled, power off now, turn the laptop over, and let it dry for at least 48 hours before trying again. Sugary liquids need professional cleaning.
- Ribbon cable. On laptops with a removable keyboard, the flat cable to the motherboard can work loose after a drop. Reseating it is a screwdriver job on older models and a full disassembly on thin ones.
- Replace. Get the model number from the sticker underneath and search for the keyboard part. If the keyboard is riveted into the top case, a repair shop replaces the whole assembly.
Work around it today
- Plug in a USB keyboard or pair a Bluetooth one.
- Use the on-screen keyboard: Win+Ctrl+O on Windows.
- Copy any symbol you cannot type from Copy and paste symbols.
- Remap dead keys to working ones with PowerToys. See How to remap keyboard keys.
Troubleshooting flow
- Test in the tester above.
- Toggle Num Lock (Fn+Num Lock) and Fn lock (Fn+Esc).
- Turn off Filter Keys and Sticky Keys.
- Check the layout with Win+Space.
- Reinstall or roll back the keyboard driver.
- Power reset.
- Test in BIOS to confirm hardware or software.
- Clean, dry, reseat, or replace.
Related
Frequently asked questions
How do I know if my laptop keyboard is broken or it is a Windows problem? +
Restart and press the key to enter the BIOS or UEFI setup (often F2, F10, Delete or Esc). If the keyboard works there, the hardware is fine and Windows is the problem. If it fails there too, it is hardware.
Why do my laptop letters type numbers? +
Num Lock is on and your laptop has a numpad overlay on the U, I, O, J, K, L, M keys. Press Fn+Num Lock, or Fn+F11 on many models, to turn it off.
Can I use an external keyboard with a laptop whose keys are dead? +
Yes. Plug in any USB keyboard or pair a Bluetooth one. It works alongside the built-in keyboard immediately.
Will a Windows update fix a laptop keyboard? +
It can, when the cause is a bad driver. Check Settings → Windows Update for optional driver updates, and check the laptop maker's support site for a keyboard or chipset driver.
Is a laptop keyboard expensive to replace? +
On older laptops the keyboard clips out and the part is cheap. On most thin models it is riveted to the top case, so the palm rest is replaced as a unit and labor is the main cost.