Newly Built PC - CPU Fan Won't Run

Hello,

Intel i-5 3570k
Intel LGA 1155
Antec 900
OCZ ModXStream Pro 700W
2 4gb 240pin RAM (RipJaw Series if needed)

Just built this yesterday and spent most of the day trying to figure out why my cpu fan isn't working, here is the troubleshooting performed:

Plugged system header fan into the cpu fan slot to see if it runs, runs just fine, put cpu fan into system header fan slot, it sputtered and stopped, was the most movement I saw out of that heatsink fan.

The interesting thing is, the system header fan, when plugged into the system header fan slot, turns on for a few seconds and stops, but when in the cpu fan slot, it runs constantly.

I get display, and I'm able to boot to the BIOS. I removed RAM to make sure I got the beep code, and that was received.

No wires are in the way of the CPU fan, I also tried reseating the processor just in case, and triple checked to make sure it was in correctly.

Everything else works, except for the CPU fan.

I'm about ready to say it's the fan, or the motherboard, but would like your input.

Thanks!