I just built my new computer today and after getting everything assembled I connected my monitor and nothing came up, also after many re-boots I noticed there was no POST beep, or any sort of beep at all. The LED's and fans of all components do work!
If you are not resolved going through the guide and breadboarding (linked to in the guide) then RMA has to start somewhere. As I said before no beeps (with speaker) points to motherboard a working motherboard will beep if no ram is installed for example.
This may be a late reply, but, have you tried to hit the MemOK Button? Made sure the Core Activation switch was turned OFF? Also, I found that if the 4-Pin CPU Fan is not plugged in, mine will not post beep at all, (knocked my plug loose rerouting wires last time I was in it). Check to make sure you have the RAM in the proper slots. Last but not least, this motherboard is very picky about the RAM it will take, did you check with Crucial's Website to make sure those 8GB RAM cards would be compatible? When I bout mine I didn't see any 8GB Cards on the list, but a 2x4GB. Also, Sugestion, buy 1333 Ram as that is the fastest it will run w/o O.C. Installing PC3-1600 you will have to manually set EVERY aspect of the System: CPU speed, Multiplier, CPU/NB Speed &Voltage, RAM Speed&Voltage, and more, but it will run on Auto, at partial speeds.