Device troubleshooting
Keyboard Keys Not Working?
Reviewed: 31 October 2026
A missing key highlight can come from the page, a keyboard setting or the device itself. Start with a short input check, then follow the branch that matches what you observe.
1. Check whether the key reaches the browser
Open the Keyboard Test, click inside its testing area and press the affected key by itself. Compare it with nearby letter keys. Release the key and repeat several times. Keep passwords and other private text out of the test.
- Nothing responds: click the test area again, then try an ordinary text field in another app.
- One key is missing: compare that key in another app and, where possible, another computer.
- A key stays highlighted: release it, refocus the test and reset the session before deciding it is stuck.
- Only a combination fails: use the Keyboard Ghosting Test to compare that exact combination.
These comparisons narrow the next check. A browser result alone cannot establish which internal component is faulty.
2. If the whole keyboard is unresponsive
Check its power and connection. For a USB keyboard, reconnect it and try another port directly on the computer. For a wireless keyboard, check its battery and confirm it is connected to the intended device. Follow the manufacturer's pairing instructions if it has lost its connection.
If the keyboard still fails in several apps, compare it with another keyboard or computer. Note which connection you used so the comparison is repeatable.
3. Check settings that change key input
Windows 11: open Settings, Accessibility, Keyboard. Filter Keys can ignore brief or repeated presses. Review it if short presses are being missed; if it was enabled unintentionally, turn it off and repeat the same check. Keep any accessibility settings you rely on.
Mac: open System Settings, Accessibility, Keyboard and review Slow Keys, which can require a longer press. In Accessibility, Pointer Control, check whether Mouse Keys is assigning keyboard controls to the pointer.
4. If the key produces the wrong character
Check the selected keyboard layout before treating this as a failed key. In Windows, select the input-language icon on the taskbar and choose the intended layout. On Mac, review the Input menu and the input sources under System Settings, Keyboard, Text Input.
The test's character and physical key code can differ: a code identifies a key position, while the resulting character depends on the active layout.
5. Use the comparison to choose the next step
If the key works in other apps but not one page, investigate that page's focus or shortcut handling. Some Fn, brightness and system controls may never reach a webpage. If the same ordinary key repeatedly fails across apps and another computer, record the pattern and contact the keyboard or laptop manufacturer for the appropriate service route.
After each change, return to the Keyboard Test and repeat the same presses.
Official sources
Reviewed against official documentation on 31 October 2026. Menu names can vary by operating-system version and device.