Ahh ok on the PSU! Sounds like you have it all setup correctly, no error beeps, or do you not have a case speaker connected? If you do not have a speaker connected please connect one.
What CPU are you using?
Does the board stay running, or does it cycle on / off quickly? Please try connecting the 8 pin CPU connector to the lower 8 pin connector on the board, if you have it in the upper one now.
If none of that helps, you may need to remove the CPU and check to make sure there are NO bent CPU socket pins, if a single one is bent or broken the board might not start. << Wait on this until you tell me about the CPU you are trying, in case it's just the CPU might not be compatible with the BIOS installed. If this is the case, do you have or can you borrow an older CPU from somewhere like 920-920?
Was this all new, or did you buy used?
Also, before you try anything else! Please try clearing the CMOS. Unplug the power supply from the wall, or switch it off, then press and hold the case power on button for one minute. Then short the Clear CMOS pins for a minute, then remove the short and turn the power supply back on and see if it will start then.
And remove ALL hard drives, CD/DVD drives, and anything else you have connected like USB hubs, printers, ect. As any one of those things if bad can cause the board to not start.