Hi @Sarandev NK,
Welcome to Microsoft Q&A forum.
I understand that your laptop keyboard has become unresponsive, even though initial system diagnostics indicate that the hardware is functioning correctly. Having limited USB port availability makes a functional integrated keyboard essential. The keyboard is failing to register input within the operating system. Since hardware tests passed, the conflict likely stems from software configurations, driver corruption, or outdated system firmware.
- Verify Accessibility Settings: Windows includes a "Filter Keys" feature that can cause the keyboard to ignore brief keystrokes. Navigate to Settings > Accessibility > Keyboard and ensure that Filter Keys is toggled Off.
- Reinstall Keyboard Drivers: Right-click the Start button and select Device Manager. Under the Keyboards section, right-click your device and select Uninstall device. Restart your laptop to allow Windows to automatically reinstall a clean version of the driver.
- Update System Firmware: Visit your laptop manufacturer’s support portal. Enter your model information to check for any pending BIOS or Firmware updates, as these often resolve communication issues between the hardware and the OS.
- Execute System Troubleshooter: Go to Settings > System > Troubleshoot > Other troubleshooters and run the Keyboard tool to identify and repair underlying software conflicts.
If these steps do not restore functionality, the issue may involve the internal ribbon cable connection. Please let me know if you require further assistance or specific driver links.
I hope this information is helpful. Please follow these steps and let me know if it works for you. If not, we can work together to resolve this.