So started with 2 in (8gb, fine) then when I went up to 16gb I realised slots A1 & B1 weren't detecting any memory. So I installed all 8 modules again and none of the DIMM slots A1/A2/B1/B2 were detecting any memory at all. I had 8 sticks of Corsair Vengeance LPX. MEMOK button did not resolve the issue. X99-Deluxe DIMM slot problems.Discus and support System not detecting slot 1 with 4GB RAM. in..