I have a spike guard that is showing line and neutral reversed. Those 2 Leds glow. This wasnt happening before the wiring was changed of the house. Now when i connect a mobile charger(with 2 pins) then the mobile gets charged, but when i connect a three pin hard drive power cord to it, then the hard disk doesnt work. Is there problem with the hard disk or the line n neutral reversed glow of spike guard is an indication of some other fault. or is there fault in the spike guard?