Help! New Build Won't boot/no video

Most comon problem, not plugging in the 4 pin power connector. In your case it is on top of and behind the cpu socket.

1) Well, you're missing a power supply. Systems normally work better if one is present...
2) Does your MB or case have a speaker? Perhaps you're not hearing any beeps because there's no speaker.
3) Most likely: your board/BIOS doesn't support the new 45nm CPUs.

Sadly this is often incorrect -- many people are having problems. According to the Asus website CPU list, the new CPUs are supported as of BIOS 0107. However, it's only in the descriptions of BIOS versions 0304 and 0402 that "support new CPUs" is mentioned. Since BIOS 0402 is dated March 21, 2008, I'm pretty sure your MB has an earlier BIOS, and thus does not have the latest "new CPU" support. If this is the issue, your MB should work fine with an older socket 775 CPU -- of course, most of us don't have spare CPUs lying around.

PS - Thank you for recognizing my brilliance -- most are not as perceptive as you!
PPS - There are sometimes issues with running 4 DIMMs; try installing just two (or even just one) and see if that allows you to boot.
PPPS - You also might have a defective power switch. Try just briefly shorting the power switch header pins instead to test this.

Not with their original BIOS's.

Have you contacted Asus tech support yet? They should know more about your specific MB model. In any case, I'm just offering a suggestion based on what I've seen on the Asus site and on forums -- even with my brilliance, I could easily be wrong.