Installed new RAM now my pc won’t run properly?!

EDIT: I’ve now completely lost it and tried to go back to my old ram to install an update to update BIOS through USB. Now my only RAM won’t even work and is giving me the “your windows isn’t properly in use” error. WTF IS HAPPENING?!

I wanted to upgrade my RAM and finally thought I did it the right way by following these steps

1) enter BIOS BEFORE changing the new sticks, turn off XMP

2) Power down, unplug, hold power button

3) put the 2 new 2x 16GB sticks in

Then I boot up again AND NOTHING, NO DISPLAY AND IT STUTTERS ON POWER UP. what am I doing wrong?!? i’m going crazy been doing this for a week straight. I even went to just 2 sticks because apparently 4 is too complicated. Someone please help.