Everlasting RAM Nightmare

[Pizzainspace]

Before responding, please check my parts list and let me know if there are problems: https://pcpartpicker.com/list/7hTYJ

I have 2 kits of Kingston Fury Beast DDR4 RAM, 2x8gb. They were purchased 6 months apart.
At the start, all 4 sticks were working fine together. Until suddenly some games kept crashing my PC, shutting it down. 
I switched to 2 sticks and it was working fine.

Recently I decided to dualboot Windows with Linux, buying a Kingston NV3 alongside my Crucial P3.
Once I added the new SSD, the RAM went haywire once again. 
Switched to 1 stick.

Eventually I got it to work with 2, but now back to 1.
I have no idea what causes it.
In all my testing, both A slots (A1, A2) stop working, and only B1 works. No sticks can work together.
Also, I DO know which ones are from which kit and have no trouble putting them together.

Here's what happens when I try booting with more than 1 stick:

1. CPU debug light goes on
2. After some time the DRAM debug light goes on and never goes out
3. PC never goes away from that black screen

I have no idea on what to do anymore. Nothing works, even a CMOS battery reset doesn't work or a BIOS settings reset.

Things I've tried so far:

• Cleaned CPU socket and pins
• Posting without the new SSD
• BIOS is updated to latest version
• Checking each stick of RAM (they work, but the PC won't let it post)

[leclod]

So you have 4 sticks total and currently only using 1 (8GB) ?

You have no bent cpu pins (edit : you have the pins on the cpu so it's less likely) ?

You're at stock settings (bios) ?

Edited March 20 by leclod

[Pizzainspace]

1 hour ago, leclod said:

So you have 4 sticks total and currently only using 1 (8GB) ?

You have no bent cpu pins (edit : you have the pins on the cpu so it's less likely) ?

You're at stock settings (bios) ?

Yes

[leclod]

If you are running games in windows (I have no idea about dual boot)

Did you try the usual (or rather can you ?) :

open cmd as administrator and run both;

DISM.exe /Online /Cleanup-image /Restorehealth (le processus peut se bloquer temporairement pour télécharger un fichier)

sfc /scannow

Edited March 20 by leclod

[Pizzainspace]

11 hours ago, leclod said:

If you are running games in windows (I have no idea about dual boot)

Did you try the usual (or rather can you ?) :

open cmd as administrator and run both;

DISM.exe /Online /Cleanup-image /Restorehealth (le processus peut se bloquer temporairement pour télécharger un fichier)

sfc /scannow

I do not think this is a Windows problem.

It is purely a hardware issue. I’ve stated that once I switched to 2 sticks, games went fine, they only crashed with 4 sticks.

[Pizzainspace]

I eventually found the issue: the motherboard.

 

I narrowed it down by lots of testing. First, I changed the cpu cooler to the default AMD one to make sure the uneven pressure on the cpu is gone. Ram still didn’t work. After lots of fidgeting, I found that the slots would randomly go haywire and stop working. That means it’s the motherboard.