The answer to 'surge protector making buzzing noise' is that a buzzing sound from a surge protector is usually a sign of a problem. This can indicate that the surge protector is malfunctioning and may need to be replaced. The buzzing noise is often caused by an issue with the electrical components inside the surge protector, such as a bad capacitor or transformer.
If your surge protector is making a buzzing noise, it's best to unplug it immediately and stop using it. Continuing to use a malfunctioning surge protector could lead to damage to your electronic devices or even a fire hazard. In most cases, the surge protector will need to be replaced, as it's generally not possible to repair these devices at home.