The "Power Lost Control" and "Main Power Override" are two very distinct features. Main power override is like an "Always On" function. So if the main power is connected and JP7 is set the system should remain on, regardless of the power button. Power Lost Control: Last State - if power is removed and then re-applied the system will return to it's state (on or off) prior to power removal. Power Lost Control: Always Off - if power is removed and then re-applied the system will remain off.