Run memtest86+ on each stick individually to verify that each stick is good. You should get NO errors on at least a full pass.
If you have a good stick, test it in each of the ram slots to verify that all the slots are good.
Ultimately, do what the motherboard manual says as to where to install two sticks. And test again with memtest86+.
A last possibility is to check for any motherboard bios updates that might address your problem.
DO NOT update the bios if it will not likely fix the problem. A failed bios update can permanently brick your motherboard.