The green line is raised up to 5 V by a very weak source so that when the motherboard shorts it to ground to boot the PSU up it doesn't fight it or damage anything. I would be surprised if the source was even capable of providing 100 mA, remember, its normally running a dead short between it and ground when the system is on so you don't want to have much if any current capability there or you can start heating up wires and efficiency takes a hit.
And as delluser said, you were doing so well, i was surprised. Stick around, you have potential.