Guitar Buttons Not Recognised

Unfortunately, if the hardware is defective, it would likely be both easier and cheaper to replace the controller. That said, if you recently hooked your system up to a different TV or new system, you may need to callibrate the game to your TV. If the the callibration is off, it can seem as if your buttons are only registered sometimes or not at all because you still get the buzz and loss of popularity from the strum bar.