Ram wont work

Feb 15, 2018
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I bought new ram 2x crucial 8gb ddr3 1600.

I removed old ram and inserted both new ones. I got a fast bepping and computer shuts down in a 10second and restarts itself.

If I add only one ram stick it works fine. It doesnt matter in which sloth I put it in.
Whenever I add the second ram it beeps. It just happens with one ram stick, the other is working fine.

My mb is gigabyte ga h81 and it supports 1600 16gb ram.

It looks like the one ram stick is not working, what could I try. The rams are both brand new.

What can I try?