A laptop keyboard that suddenly stops working is alarming, but most cases come down to a handful of causes you can rule out yourself in a few minutes. Work through these in order — they go from quickest to most involved.
1. Confirm which keys actually fail
Before anything else, find out whether it’s the whole keyboard or just a few keys. Open our keyboard tester and press every key. Keys that don’t light up are the ones not reaching your computer. If no keys respond, the problem is more likely a driver, connection, or software issue than dozens of dead keys at once.
2. Restart the laptop
A surprising number of keyboard glitches are temporary software hiccups. Save your work and do a full restart — not just closing the lid. This clears stuck processes that can block keyboard input.
3. Check for a stuck or toggled key
A jammed key — often a modifier like Ctrl or a sticky spacebar — can make the whole keyboard behave strangely. Press each modifier firmly a few times. Also check that features like Filter Keys or Sticky Keys haven’t been switched on by accident in your accessibility settings.
4. Update or reinstall the keyboard driver
On Windows, open Device Manager, find your keyboard, and choose to update the driver. If that doesn’t help, uninstall it and restart — the system reinstalls a fresh driver automatically.
5. Rule out a frozen system
If the screen isn’t updating either, the laptop may be frozen rather than the keyboard being broken. A hard restart fixes this.
6. Clean under the keys
Crumbs, dust, and dried liquid are the most common physical cause of dead keys. Turn the laptop off, hold it at an angle, and use compressed air across the keyboard. For a single sticky key, a little isopropyl alcohol on a cotton swab around the edges can help.
7. Try an external keyboard
Plug in a USB keyboard. If that works perfectly, you’ve confirmed the fault is in the built-in keyboard hardware, not your operating system.
8. Check for liquid damage
If a spill happened recently, liquid may have reached the membrane or ribbon cable beneath the keys. This often needs the keyboard removed and dried, or replaced.
9. When it’s a hardware fault
If specific keys still fail in our keyboard tester after cleaning and an external keyboard works fine, the internal keyboard likely needs replacing. On many laptops this is an inexpensive part, though labor varies by model.
The fastest way to know
Whatever you try, re-run the keyboard test afterward. Because it reads the same signals your operating system uses, a key that lights up there is genuinely working again — no guesswork.