To determine if a sticky key issue is due to dirt or hardware, first inspect the key for visible debris, residue, or signs of damage. Test the key’s movement—physical obstruction often indicates dirt, while normal feel with no response suggests hardware or software issues. Use a keyboard tester to check input and try cleaning with compressed air or a soft brush. If the problem continues, update drivers or test an external keyboard to rule out system issues. Persistent unresponsiveness may indicate hardware damage and require professional help. Fix sticky keyboard keys is very important to ensure the smooth running of your system.