I don't know if this is just how things work, or if it's unusual. With other motherboards, when I have bench tested them to make sure that everything is set up fight, before I install them into my case, I just connect the two power pins, and the MB starts running. With the B450-f though, I've found that I have to also connect the two PLED pins at the same time as well to start this MB. Can anyone else comment on this?