I just finished putting together my new lga2011 system. When I went to power up, the fans start for .5 seconds and then they shut down, after about 3 seconds, the fans start again for about .5 seconds and then they shut down. I removed and then reseated the memory. I unplugged all the cables to the case, still the same result.
glass try one dimm to see if the mb cant set the ram speed right. also check that the 4/8 pin atx power connected.
if your mb is an asus brand see if it has the usb flashback port and flash the bios to the newest rev.