Black screen after RAM upgrade

May 23, 2018
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Hi,
I have a ASUS g551vw laptop with "M471A1G43DB0-CPB – SAMSUNG 1x 8GB DDR4-2133 SODIMM PC4-17000P-S Dual Rank x8 Module" and have another "Kingston KVR21S15S8/8 8GB DDR4 2133Mhz Non ECC Memory RAM SODIMM". When I install the latter (either with the old RAM or by itself), I get black screen but fans and lights work (and it's not a slot problem since my old ram works in both slots). I have double checked and it seems both these RAM sticks share the exact same specs. Where do you think the problem might be?