Here are some steps to try when your keyboard or mouse is not working:

1. Check for Physically Obstructions: Check your device for any blocks, debris, or stuck keys.
2. Check Your Device’s Connectivity: Make sure the wireless receiver for your device is properly connected.
3. Check Device Settings: Confirm that the device settings are appropriate for the application.
4. Check for Software Updates: Ensure that your device’s software is up to date.