This is beyond ridiculous, this motherboard has been nothing but trouble, it threw error code 55 for hours and hours when I first built it which is RAM related. Now this?
I just tried every possible combination, including only one card in each slot, they all work fine, two cards always throws an AE code. Bios is up to date. I had the sound card removed for all tests. Nothing, nada. I also tried Hiviz idea of changing display inputs, nothing. This is infuriating, my fingers are ridiculously sore from pulling the power cables out of the GPU's!