Optiplex 380 RAM Upgrade

I have purchased and attempted 2 different RAM upgrades on my PC and both have failed.

It currently has 2x2GB and want to upgrade to 2x4GB. I have tried both brand new DDR3L and DDR3 in 1600MHz.

PC will not boot will not display it just beeps.

The current working ram is labelled. MTBJTF25664AZ-15401