Were there any doubts?

I am not American, absolutely not republican (they really should change that to oligarchic) or conservative, nor sympathizer. I honestly agree with their pessimistic view.

Plug everything back in, and unplug the PW+ and PW- connectors from the motherboard.

Use a flat screwdriver to touch both of them at the same time and see if it boots. If it does, either is one of those two cables, or the power button itself.