Hey guys, my surge protector makes a loud humming noise and the only way to disable it is unplug it.
After hours of leaving it unplugged it still remains
Why would it change?
You didn't mention the model of your device, so we can only speculate generally. Could be the windings of an inductor or transformer vibrating, or the way the component is mounted. If so, only way to eliminate the sound would be to replace the offending component or the entire unit.
Nonsense. They owe you nothing because you are out of warranty. And they still offered you 50% off. That is good customer service.
If you expected a lifetime warranty, you should have made sure of that before you bought. You would have had a hard time finding it. MOV based surge protective devices have a limited, although not necessarily short, lifetime.