Custom PC wont turn on, power switch/button

I don't see how "sparking" it with a screwdriver would help at all. Double check and make sure you have all the front panel headers headers in the right place, and try flipping the power one around the opposite way. If that doesn't work, it could be a problem with your case's power button. Depending on your case, there is usually some way to fiddle around until you can reach the circuitry behind the font-panel buttons, usually from the inside of the case. If no connections are blatantly severed, it could be something pretty hard to fix. Otherwise, to eliminate the possibility of the standoffs creating a short behind the mobo (Rare, but it happens) take out the board, put it on top a cardboard box, connect everything, and try again. This kind of thing is exactly why I prefer motherboards with power buttons on them.