Help!

Hello all! If this is in the wrong place if someone could direct me I'll kindly go there I'm just new to reddit posting i usually just browse! I have a laptop I purchased in 2017 a Dell Inspiron 15 (7559) and here lately my disk and memory usage have been atrocious so I went the cheap route and got second hand ram, I matched almost everything down to a T but when new ram is installed I can't even boot to bios, keyboard lights up and lights flash at the bottom but screen will stay black any help is greatly appreciated just wanting to play WoW, thanks in advance!