Identify the pattern
Check whether keys are physically stuck, enter the wrong characters or do not respond. Layout settings, accessibility settings, software and hardware can all contribute; one failed key is not a complete diagnosis.
Use a temporary input method
An on-screen or external keyboard may allow you to work and investigate settings. Working externally does not prove every internal component is sound. Avoid entering sensitive credentials on an untrusted device.
Handle spills separately
If liquid entered the machine, shut down and disconnect power if safe. Do not rely on drying time as proof it is ready to use. Follow manufacturer service guidance before restarting.
Check before replacing parts
Record the exact model, layout and recent changes. Use official troubleshooting rather than indiscriminate driver removal. If replacement is needed, agree the physical language layout and model-compatible part first.
Questions about this guide
How can I separate one broken key from a wider keyboard problem?
Test whether only certain keys fail and whether the issue occurs in more than one app. Note spills, physical damage and any recent input-language changes.
Can an external keyboard help while I arrange a check?
A compatible external keyboard may provide a temporary way to work. If there was a spill or other damage, stop using the laptop until the safety and internal damage concerns are assessed.