Now that I've built my new pc, I want to try and see what's wrong with my old one. I think I have a bad mobo so I borrowed a working one from my brother-in-law. Trying to see if it is the mobo or power supply. I know the processor and video card(s) are good. I have 2 different power supplies, two different motherboards, 2 vid cards, enough ram for each to have 2 sticks. I have connected the ATX and ATX 12 V to the mobo. The cpu hs/fan is connected to the correct header. I know I am getting power to at least one mobo because it has a small amber LED that will light up. Not sure about the other mobo because I borrowed it. I've used a flat tip screwdriver to quickly (and not so quickly) touch both power pins to make a connection. Nothing. No fans at all. Also, mobo is on a cardbooard box top so nothing can be shorted out. Any other suggestions?