X58 Pro will not power on

CPU: Intel Core i7 920
Motherboard: MSI X58 Pro LGA 1366
Memory: OCZ 6 GB (3 x 2 GB) 240-pin DDR3 13333 (PC3 10666) SDRAM
Video Card: nVidia 9800 GTX+ 512 MB
PSU: Rosewill RP600V2-S-SL-S 600W
I just received all my parts today and I set everything up. I'm fairly certain that I put every power cord in the right spot. I have the CPU, heatsink and fan, three RAM modules, video card, two SATA hard drives, one SATA DVD drive, and the PSU hooked up. The LED power light on the motherboard lights up, but when i press it, nothing happens. When I press the on button on my case, nothing happens either. The fans don't start, it doesn't post - it seems completely dead.
Does this seem more like a motherboard problem, or a power supply problem? Maybe one of them was dead on arrival? Thanks in advance for you help!

Tried what you suggested - nothing.
Minus the lone green LED light on the power button on the board itself, there really is no other indication that there is any electricity. Yes, there is a power button on my power supply, and it's turned on. I can tell when the power's on, because when i have it unplugged, the LED light goes off. It's just weird that electricity is getting to the light, but no other part of the motherboard...
If i did connect something wrong, which is possible, do you have any suggestions of what it might be? My power supply has a 20 + 4 pin cable, and i connected the 4-pin on pins 12-24 (closer to the top of the motherboard) and the 20-pin closer to the SATA connectors. That's what the directions said to do. Other than that, I connected two 4-pin cables right to the left of the CPU, in order to power the CPU. Those are the only power cables that connect directly from the PSU to the motherboard.

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