Now I'm confused as to what you are trying to achieve with this switch. The earlier post suggested you want to interrupt the mains, replacing the black switch on the back of the PSU.
And why are you messing with the green wire at all?
By far the simplest solution is to leave the mains alone, and just use the momentary switch to operate either the power or the reset. If you must turn off the mains too, it's still possible, but the switch needs to stay in two positions.
I think the wiring would be:
Pole 1 mains in
1/1 NC
1/2 mains out
1/3 mains out (2-3 connected together so there's power in both positions)
Pole 2 one side of pulse trigger
2/1 NC
2/2 other side of trigger
2/3 other side of trigger (again, 2-3 connected)
Pole 2 one side of mobo reset header
2/1 NC
2/2 NC
2/3 other side of mobo reset header
So, position 1, mains is off, nothing else matters.
Position 2, mains on, power signal is pulsed
Position 3, mains still on, power unaffected, reset is activated.
It would be nice if the spring could make pos'n 3 spring back to pos'n 3
Also, the switch needs to me make before break or you'll interrupt the power when going for the reset, and probably retrigger the power on pulser too.
Personally, I wouldn't mix mains and low voltage on the same switch. I'd just go with the simple solution. Failing that, get a wafer switch and two wafers, one regular and one for the mains.