Wrong RAM slot perhaps? I had this happen to me on my i7 build. Try taking EVERYTHING (even the ram) out and just leave the CPU in. See if it does some post error beeps.

I don't see any onboard video on that motherboard. Oh well.

Did it come with a speaker to plug into it? (It goes (at least it did with my P6T) alongside the pins you plug your start button/led lights). It might not have a built in speaker, so...check.

Kinda hard to listen to POST beeps when there's no speaker.