Check that the keyboard is properly connected
Try a different USB port or cable
Turn the keyboard off and on again
Replace or recharge the batteries
Restart the computer
Unplug and reconnect the keyboard
Test the keyboard on another device
Try another keyboard on the same device
Clean the keyboard keys
Disable and re-enable the keyboard in Device Manager
Update or reinstall the keyboard driver
Check keyboard language and input settings
Turn off Filter Keys, Sticky Keys, and other accessibility features
Remove any stuck keys
Check for physical damage
Boot into Safe Mode and test the keyboard
Update the operating system
Reset the keyboard if it has a reset option
Contact the manufacturer if the problem continues