That seems to be pins 4, 6, 21, and 22, which are all +5V pins. I'd check the power supply to see if it's providing that power properly. Of course, since it's ATX, you really need a special tool to do that (since you have to send it a signal to turn on at all).

I don't remember what +5V powers in a computer, though, so I'm not much help there. My guess is that it's your power supply that's the problem though. But I could easily be wrong.