So it turns out not all things are kosher. When I got my Mac Pro and plugged it in bear (no RAM, Video Card, etc) the PCIe fan wouldn't turn on. I figured maybe because it had no RAM. Got the RAM, same thing happened. Maybe because there is nothing to cool down? Put in my new video card today, still won't spin. I fired up SMCFanControl and it read "PCI FAN", but when I try to rev it up, it does nothing and SMCFC shows a speed of "000rpm". Wonderful. Tried taking the fan out, making sure everything was aligned and plugged it back in. I tried this 3-5 times, still didn't work. I haven't tried pulling the fan out of the enclosure and running it plugged in. Maybe tomorrow I will. Anyone have an idea as to what to try?