1) take out your ethernet adapter (use onboard one, must work like a charm)
2) if it doesnt help, take out one of your RAM sticks

I have an msi board myself(but a little worse one - K9N-Neo, nForce 550), and had much trouble with pci-ethernet cards(didnt boot at all), so i had to get my onboar one to work, now everything is perfect(except for usb drives)

By the way, anyone knows how to get USB drives to work?
When i plug in one of my flash drive, it doesnt work at all, doesnt mount, no messages about it in the console, nor indisk utility, it doesnt even get lit....