Keyboard is not working

Establish the scope

Separate all-key failure from a few repeating keys or characters that differ from their labels. Compare the On-Screen Keyboard and another ordinary application. An incorrect language layout changes characters without establishing a hardware fault; loss of all input calls for power and connection checks.

Apply the safer fix first

Reconnect the receiver or Bluetooth pairing. Review Filter Keys and the active language layout in Settings.

Investigate the cause

Compare a compatible wired keyboard in recovery or firmware only if that environment supports it; Bluetooth or unsupported ports may not work there. Failure with supported input outside Windows adds hardware evidence, but is not conclusive alone. Reinstall the device only when alternate input is available.

Protect the recovery path

Keep On-Screen Keyboard or another working keyboard available before device changes. Stop using liquid-damaged hardware and do not dismantle it while powered.

Verification

• Type a harmless sample in a local text editor and check the keys that originally failed.
• Confirm the intended layout, modifier keys, and sign-in input work after reconnecting without entering a password into a test document.

When to stop

Do not continue with broader resets when liquid damage occurred, keys fail outside Windows, or no alternate sign-in exists. Preserve the observations already collected and use the device maker, network administrator, Microsoft support, a qualified repair technician, or data-recovery help according to the evidence.

Review the safe troubleshooting workflow before any broader recovery step.