There are several signs that may indicate that you need to replace your keyboard:
1. Keys not working: If some of the keys on your keyboard have stopped working, or are not registering when you press them, this may be a sign that the keyboard is damaged and needs to be replaced.
2. Sticky or unresponsive keys: If the keys on your keyboard are sticky or unresponsive, this may be a sign that the keyboard is dirty or worn out and needs to be replaced.
3. Physical damage: If your keyboard has suffered physical damage, such as from a spill or a drop, this may cause the keys to become damaged or unresponsive, and you may need to replace the keyboard.
4. Worn-out keys: If the letters on the keys have become worn off or difficult to read, this may be a sign that the keyboard is old and in need of replacement.
5. Noisy keys: If your keyboard keys are making unusual or excessive noise when you type, this may be a sign that the keyboard is worn out and needs to be replaced.
If you are experiencing any of these issues, it may be time to replace your keyboard. However, it's worth noting that some keyboard problems can be resolved through cleaning, software updates, or driver updates, so it's worth exploring these options before deciding to replace the keyboard.