Okay, so I'm not sure what information is or isn't relevant and a lot happened, so I'll list in steps what happened.
!) Got everything hooked up, turned power on, pushed power button, all fans are spinning, hard drive is spinning, DVD drive is working, except GPU fan is not spinning and there's no beep.
2) GPU came with ysplit molex to 6pin so I used that. This time even less happened. All fans spun, stopped, spun again, and this just continued.
3) Next day, used the 6pin from PSU to connect to GPU in PCIe x16 slot. Pushed in all connections from PSU into sockets even tighter. All fans work now, including GPU fan. Still no POST beep and the monitor doesn't have a signal. PCIe x8 slot has the same result. Monitor only came with VGA cable so using a VGA to dvi adapter to connect to GPU.
I would say if the CPU fan is spinning, that'd reduce the chances of the PSU being the problem. I honestly don't know what direction to point you in. I posted more or less in the hopes somebody else would see it and help you. I don't know if it's possible for a mobo to be defective on arrival, though I would assume so, but that'd be my (rather inexperienced) guess.