i bought the Aurora R9 in December and am adding 2 new 8 gig  sticks of ram matched the manufacturer (kingston hyper x fury 2666mhz).  i can add the sticks it boots then tells me ram has been changed.  confirmed in system it recognizes them, play games, stream and video edit all day no problem.  if i restart or power off then power up again i only get black screen and no power to keyboard or mouse.  i have tried using all the different slots with each ram stick and they all work fine for restarts.  just when i have the 4 in together do i have the issue and only after the second restart..