Unit is in for repair. The owner of my high end A-V store explained that surges can enter a unit from many paths, not just the power cord. So in a T-Storm, even if you disconnect the power cord from your surge protector device, that's only one path eliminated. Think about how many cables you have connected to your surround sound processor or receiver. Are you going to disconnect everyone each time a storm hits? Not likely. Yes I agree that biOdrain nailed it down to what most likely occurred.