New build not turning on, Need help in diagnosing problem PLEASE

Hello guys,
I just purchased components to build a new computer from Newegg and spent the last two days putting my new computer together. It's a medium-to-high end ($1,500) gaming/3D modeling PC with an Asrock P67 Extreme 4 Motherboard, Intel i7 2600k CPU, 16gigs Coarsair Vengeance RAM, and 800 watt gold power supply. I used this site's great forum to select the parts (thank you) but now I need your help again.

Yesterday I finished the computer and everything worked flawlessly on the first try: it booted up right away and I installed windows etc. I then spent a few hours on cable management and adding the few things that I skipped over while putting it together. Today I went to test it out and it seems to be completely dead: when the power button it pushed, a slight clinking or almost crackling sound can be heard, but the is no other activity, no lights, fans, or anything. My motherboard has a power button built in, and trying that has identical effects as the chassis power button.

I first assumed that some cable must have come loose, so I checked and rechecked everything, but that had no effect. I then spent about 2 hours taking the whole thing apart and completely rebuilding it, but when I plugged it in, it was exactly as before, just a faint sound and nothing else.

I assume that some part has died, from static electricity or whatever. I am guessing it is either the power supply or the motherboard, but I need help determining what it is. Does this sound like a power supple problem or a motherboard problem or something else? Any ideas are great, I'm kinda freaking out here. Thanks in advance!