Laptop Keyboard Not Working? How to Find and Fix Dead Keys

A few keys don’t type, letters come out wrong, or the whole keyboard stopped working. Before you pay for a repair, find out exactly what is wrong — many keyboard problems are settings, not broken hardware.

1. Test every key

Open the Keyboard Tester, click Start and choose the Laptop layout. Press every key once.

• Keys turn green: they work — if they don’t type in apps, it’s a settings or language problem (steps 2–4).
• Keys stay grey: they send no signal — see steps 5–7.
• Whole keyboard dead: try step 6 and an external keyboard.

2. Turn off Filter Keys and Sticky Keys

Filter Keys ignores short key presses, which makes a keyboard seem broken.

Windows: Settings → Accessibility → Keyboard → turn off Filter keys and Sticky keys. Holding the right Shift key for 8 seconds can turn Filter Keys on by accident.

3. Check Num Lock and Fn Lock

• On small laptops, Num Lock turns letters like J, K, L into numbers. Press Num Lock (often Fn + F11 or Fn + NumLk).
• Fn Lock swaps F1–F12 with brightness/volume functions. Press Fn + Esc on many laptops.

4. Check the keyboard language

Wrong symbols (like @ and “ swapped, or Y and Z swapped) mean the wrong layout is selected.

Windows: Settings → Time & language → Language & region → your language → Keyboards. Remove layouts you don’t use. Press Windows + Space to switch.

5. Clean under the keys

Crumbs and dust stop keys from pressing fully.

1. Turn the laptop off.
2. Tilt it and use compressed air in short bursts around the dead keys.
3. Gently press the key many times.

Spilled a drink? Turn it off immediately, unplug it, turn it upside down and let it dry for 48 hours before trying again.

6. Restart and reinstall the keyboard driver

1. Right-click Start → Device Manager → Keyboards.
2. Right-click the keyboard → Uninstall device.
3. Restart — Windows reinstalls the driver.

Also install pending Windows and BIOS updates from your laptop maker.

7. Use an external keyboard

If keys still stay grey in the Keyboard Tester after cleaning and restarting, the key switch or keyboard ribbon cable is likely faulty. A USB or Bluetooth keyboard is a quick, cheap solution until the laptop keyboard is replaced.

Gaming: keys don’t register together

Hold several keys together in the Keyboard Tester and look at Most keys at once. Laptop keyboards often handle only 2–4 keys at once in certain combinations (“ghosting”). For gaming, an external keyboard with anti-ghosting or N-key rollover helps.

Quick checklist

• Test keys → green or grey?
• Filter Keys / Sticky Keys off?
• Num Lock and Fn Lock correct?
• Right language layout?
• Cleaned and restarted?

Mouse acting up too? Try the Mouse Click Test and the Double-Click Test.