New Build Problem - I think it's my Motherboard

Accidentally put this in Homebuilt...I think it belongs here...

So I got my new PC parts in and I'm having a problem getting it to detect the video card (Galaxy GTX 670 GC).

The board is a MSI Z77A-GD65 and I'm using an Intel Core i5 3570K. My memory is 8 GB (2x4GB G.Skill Ares Model F3-1600C9D-8GAB)

So here's the deal, with the GTX 670 plugged into any of the PCI Slots, it is not detected. Nothing. It doesn't show up under device manager, and I cannot install drivers for it because it is undetected. It does not send a signal to the monitors at all.

The onboard graphics does work, and does send a signal to the monitor.

I removed the GTX 670 and swapped it into my current machine to rule itout, and it worked fine.

I assumed my issue was the motherboard, but I figured I'd test the RAM by putting it in my current machine too. I put both my ram sticks into my current machine and sure enough, it didn't send a signal to the monitors. I removed one stick of the ram, and it sent a signal - the other RAM stick by itself wouldn't. Then I thought, hmm, maybe it's one of the RAM sticks.

So I put ONLY the stick that worked by itself in my current machine into my new one, and still no signal. Tried the other one by itself, still no signal. Tried my RAM from my old PC in my new PC, still no signal.

I don't know what else to try, I am pretty sure it's NOT the video card.

It looks to me like maybe it's combination of bad motherboard and a bad ram stick?

Any suggestions would be great. I don't know if MSI will get back to me today but I plan on RMA'ing both the motherboard and RAM if I can't figure something out.