On another board someone had a similar problem and it was the voltage to the ram. They went into the BIOS and adjust the settings for the ram and it started right up. Do you have access to the BIOS or does it die to early?
Also I had something similar one time. It took me almost 3 hours (and half a head of hair) to realize that the thermal paste between my heat sink and the CPU was too thin and my CPU was over heating. Is it instant or does it take random amounts of time?
Also make sure that the switch on the front of the PSU is set to 110V
Lastly, make sure you hit both spots on your mother board with power, all drives, the video card and the fans. especially the fan on the heatsink