"boot button"? lol

Anyway, you say there is no power, but then you say a green light is on. So which is it?

Does the mother board have any lights on and does it beep any? If so look up the beeps in the motherboard's manual.

and why the hell would you use a magnetic screw driver for inside of the PC!? *** is the PWRSWTC pin? To boot, you shouldn't have to ever connect pins unless your mother board is seriously ****ed AND it's real old.