My gaming PC won't work D; Please help

Going to post this on multiple forums on this website, not sure which would be most appropriate.

Alright, so a few months ago I decided to build a beast gaming PC. The specs will be listed below. I will also try to be as descriptive as possible with my situation, and will also list the steps that I have taken -- all of which have failed -- in order to resolve it.

Ok, so here are the specs:

  • SilverStone RAVEN RV02-BW Matte black 0.8mm Steel ATX Full Tower Computer Case
  • MSI P67A-GD53 (B3) LGA 1155 Intel P67 SATA 6Gb/s USB 3.0 ATX Intel Motherboard with UEFI BIOS
  • TWO EVGA SuperClocked 015-P3-1582-AR GeForce GTX 580 (Fermi) 1536MB 384-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Cards
  • SILVERSTONE ST1200 1200W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Modular Active PFC Power Supply
  • Intel Core i5-2550K Sandy Bridge 3.4GHz (3.8GHz Turbo Boost) LGA 1155 95W Quad-Core Desktop Processor Without IGP
  • SAMSUNG Black Blu-ray Combo SATA Model SH-B123L LightScribe Support - OEM
  • G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory

So I assemble this magnificent beast, and hit the power button. The fans spin up for about 7 seconds, then shuts off. It starts back up again, then shuts off. It repeats this process endlessly, until I finally disconnect the power.

Now, here are the steps I took troubleshooting it:

  1. Reset the cmos battery -- no difference
  2. Sent the motherboard back to the manufacturer (thought it was probably defective, and so did my peers) -- no difference
  3. Checked the MSI website to make sure that my RAM was compatible with the motherboard. It is.
  4. Tried booting it with only one RAM stick. Same results
  5. Tried booting it with one video card -- same results
  6. Tried booting with NO video cards -- same results
This is the most aggravating and heartbreaking situation ever. I want this thing to work! I have it narrowed down to three possibilities:
A) The power supply is bad (least likely, it's obviously getting power since it's booting up constantly) B) The processor (I think that even though I got a new motherboard, the original one could have still shorted, which might have compromised the CPU) C) Wiring in the case (I state this as a possibility because I noticed that the reset button on the front of the case is EXTREMELY defective, sticking and/or being difficult to push)
Any and all help would be greatly appreciated. It's gotten to the point where I'll even buy whoever can help figure this out a 12 pack of Oktoberfest, or any beer of your choice.
Thanks!