No beep tone. (Although - do you have to have the front panel speaker cable connected to hear a beep tone? I'm not sure mine is connected properly - I heard the little down triangle marked the negative wire, but on mine it marks the colored wires and usually the black/white ones are the negative wires)
Anyway, at this point I've disconnected everything from the motherboard (video card, RAM, hard drives, optical drives, mice, keyboard, etc)
The CPU fan, system fan, and power supply fan all spin for a few seconds, then stop.
I have the GIGAYBTE Z68X-UD3H-B3 motherboard http://www.newegg.com/Product/Product.aspx?Item=N82E16813128498
and the intel core i5-2500k CPU
Both the motherboard and cpu are brand new. I'm trying to put them in my old case with old power supply Antec Sonata III http://www.newegg.com/Product/Product.aspx?Item=N82E16811129024
Power supply was working fine 3 hours ago.
I seek guidance on troubleshooting methods to see what is causing the failure. No beeps makes me think the mother board is shorting out. I've checked for errant wires and screws and haven't found any.