When some keys stop typing, it helps to know first which keys fail and how. A single dead key, a whole row, keys that type twice and keys that only fail in one app all have different causes.
Test it first: open the free Keyboard Tester, click the keyboard area and press every key.
- Keys that stay white never reach the computer.
- Keys that turn pink are repeating on their own (“chatter”).
- If every key passes here but fails in one program, the problem is that program’s settings or shortcuts, not the keyboard.
1. Check Windows settings first
- Filter Keys: this accessibility feature makes Windows ignore brief or repeated keystrokes, so quick presses can seem to be missing. It can be switched on by accident by holding the right Shift key for about 8 seconds. Turn it off in Settings → Accessibility → Keyboard → Filter keys.
- Num Lock: with Num Lock off, the numeric keypad acts as arrow and navigation keys. Press Num Lock and test again.
- Keyboard layout: if keys type the wrong characters (for example @ and ” swapped), the input language or layout is wrong. Check Settings → Time & language → Language & region.
- Remapping software: utilities such as Microsoft PowerToys (Keyboard Manager) or a gaming keyboard’s software can remap or disable keys. Check them before blaming the hardware.
2. Check the connection
- USB: plug into a different port directly on the computer, not a hub.
- Wireless: replace or charge the batteries and move the receiver closer. A weak signal causes both missed and repeated keys.
- Bluetooth: remove the keyboard in Settings → Bluetooth & devices and pair it again.
- Swap test: try the keyboard on another computer, or another keyboard on this one, to tell keyboard and computer problems apart.
3. Clean it
Crumbs and dust under keys are a very common cause, especially on laptops.
- Turn the device off, tip the keyboard upside down and tap it gently.
- Blow compressed air at an angle around the stuck keys.
- On mechanical keyboards, remove the keycap with a keycap puller and clean underneath.
- After a liquid spill: turn the device off straight away and let it dry thoroughly before testing.
4. Drivers
Open Device Manager, expand Keyboards, right-click your keyboard and choose Uninstall device, then restart. Windows reinstalls the standard driver on startup.
5. Hardware faults
- One key: on mechanical keyboards, a hot-swappable switch can be replaced in a minute; soldered switches need repair. Laptop keys usually mean replacing the key mechanism or the keyboard.
- A whole row or block of neighbouring keys: this usually points to damage in the keyboard’s internal circuit or its ribbon cable, not individual keys. On a laptop that’s a repair or warranty job.
- Keys typing twice (chatter): see the chatter section on the Keyboard Tester page. Cleaning or raising the debounce time in the keyboard’s software often helps.
Sources
- Microsoft Support, Make your mouse, keyboard, and other input devices easier to use (Filter Keys “ignore brief or repeated keystrokes”; Settings → Accessibility → Keyboard).
- Microsoft Support, Using the Shortcut Key to Enable FilterKeys (holding right Shift for eight seconds).
- Logitech Support, Keyboard/Mice – Buttons or keys do not work correctly.
Last updated: October 5, 2026. Researched and written by 123EasyTech Editorial.
