Is the system getting power, do you hear/see your fans but nothing happens after? if so then .. try clearing the cmos you can find directions here
i have same board, mine ran ok for about a year..
if that doesnt work id start the tried and true method of removing all memory n see if you get the error beeps, then video card/cards
to track down the problem
My guess is bios considering what ive gone thru when i 1st built system and now after about a year. Clearing it should help.
If no power at all then it could be bad power supply.