PC Problem

So, I had trouble with uninstalling ASUS AI Suite 2 and asked reddit about it because my screen always popped up with 3 error screens of FanXpert.exe failed and fanutility.exe failed.
Figured out it was ASUS AI Suite 2 which was causing it, as it was part of my old mobo driver (I'm reusing my ODD, HDD, and PSU). So I surfed the internet for something to help me get rid of AI Suite, people recommended RevoCleaner, I installed that and Forced Uninstall the ASUS program. After uninstalling, I rebooted my PC to see if the error still popped up. The error did not pop up.
After, I checked the System Specs in Control Panel, it listed that I had 4GB of RAM which was weird, as I had installed 16GB of RAM.
I rebooted my PC 2 to 3 times to check if it still popped up as 4GB. It still did. So I turned off my PC and unplugged it. Then I reseated my RAM. Tried turning on the PC, then it all went downwards.... :( My monitor, keyboard, and USB mouse didn't work.

The QCode on my Mobo changed from All is good to Memory initialization error.

So I tried to use the sticks 1 by one. No dice.

I then bought another set of a different DDR4 ram that I checked that is compatible with my mobo.

Installed new RAM, no dice. Tried the 1 by 1 method. No dice.