Question Monitor, mouse, keyboard not working.

[Cl0udy]

So I wanted to buy more RAM, since 8GB is not enough for me, so I take out the ram and see the number ect. Then I put it back in, then I turn on my pc and boom, my monitor doesn't work either my keyboard or mouse. Please help me since I am very scared. Don't bully me I'm a newbie to pcs

 

[JohnBonhamsGhost]

have you tried re-seating the module to make sure it was properly inserted?
what DIMM slot are you using?

and always provide complete system specifications when posting for help.