test each stick one at a time in the board,just one stick in either of the white slots just to confirm non are dead,then try enabling xmp if it supports it or upping the dram voltage to 1.6v or whatever its rated at and raise the cpu vtt one or two clicks
I've tried single ram in the 2nd white slot on their own and it does the loop every 3seconds or so - does that narrow down the issue to mobo after testing the ram in slot1 and memtested it fine?