Hello everybody.
I just built a new watercooled system with Asus Maximus Formula. But I have an interesting problem. Ram slots A1-A2 (blue and white banks near cpu socket) are not working it seems. I tried with different sticks of ram and I always get a DET DRAM error on lcd poster and the system fans just keep turning but no video. When I put sticks in B1 and B2 or single sticks in B1 or B2 the system boots up fine. However I can't use dual channel technology.

When I first bought this board all the ram slots were working because we have tried it. I upgraded the bios from 0401 to 0903 but no use. Can it be a memory compatibility or a motherboard bug. Or just two bad ram slots? Does anyone have a similar problem?