One keyboard key is not working
Check whether the key reaches your browser, compare it in another app, then change one part of the setup at a time.
Updated 8 September 2026 · Observation method v2
An unlit key is a starting point.
A key can be missing from the test because it was not pressed, the test lost focus, the selected drawing does not match the keyboard, or the system intercepted it. Start with one suspect key and a nearby key that usually works.
Make the result reproducible
Match the reference to your keyboard
Choose the closest layout and size. Exclude only keys that are physically absent. A key you own but cannot detect must remain in the coverage. The drawing is a reference; it does not discover your hardware.
Press, release, then compare
Activate the test area. Press the suspect key once and release it fully, then do the same with the nearby key. Repeat three times without switching apps. Check both the detected position and whether the held state clears.
Follow the branch that matches your observation
- Neither key arrives
- Reactivate the test and try again. If all keys remain absent, check power and the connection before investigating one switch.
- Only the suspect key is absent
- Try that key in a blank local document. Compare the same ordinary key on another keyboard or computer if available.
- The position arrives, but the character is wrong
- Check the operating system’s input language and any remapping. Changing the test’s drawing does not change your typing layout.
- A key arrives alone but not in a combination
- Repeat the exact combination, then try the same keys in a different order. Record only the combination observed; this does not measure every possible combination.
Change one condition, repeat the same three presses
For an external keyboard, compare another port or a direct connection instead of a hub. Check the wireless power level. Microsoft documents these connection checks for Windows. Keep the browser, key and gesture the same so the comparison means something.
Repeated letters need a different check
Hold an ordinary letter briefly, then release it. Automatic repetition during a hold can be normal. The browser can flag a held key’s repeat events; these are different from new press-and-release cycles. Neither signal alone proves a faulty switch.
If a short tap produces unwanted repeated characters, use the guided per-key check, then compare short taps in a blank document. Record whether it happens only during a hold, on release, or with separate taps. Do not type passwords or personal information into a test.
Know when the browser cannot settle it
Fn, media keys and system shortcuts may never be delivered to the page. Tab and Escape are deliberately available to leave the test. A touchscreen keyboard is not a reliable substitute for testing physical key positions.
On a Mac, accessibility settings such as Slow Keys can change how a press is recognised. Check the current settings against Apple’s keyboard troubleshooting instructions; preserve any accessibility setting you depend on.
If the same ordinary key repeatedly fails across applications and another compatible connection or computer, record that comparison for the seller or support team. The fault is more reproducible, but this page cannot identify its electrical cause. A disassembly or firmware reset is not the next automatic step.