Question Problem with new system

[gtsolid]

Hi,
2 months ago I assembled a new PC and yesterday it didn't start (black screen).
The MB (an X670E AORUS XTREME) whas showing a debug LED meaning "Pre-memory North-Bridge initialization is started."
I unmounted components, switched RAMs and then it restarted to work.

Since it's a workstation i'd like to understand what happenened and how to avoid the repeating. Can you help?

 

[Lafong]

You replaced the old RAM with different RAM.

Did you attempt to boot with just 1 stick of the old RAM?

Did you attempt to boot with just 1 stick of the old RAM in all available RAM slots on the motherboard?

What is the full description of the old RAM? Of the different RAM?

 

[gtsolid]

> You replaced the old RAM with different RAM.
No

>Did you attempt to boot with just 1 stick of the old RAM?
Yes, it booted with both the sticks on the more to the right

>Did you attempt to boot with just 1 stick of the old RAM in all available RAM slots on the motherboard?
Only in the most right place

What is the full description of the old RAM? Of the different RAM?
I have a kit of KF560C36BBEK2-64. No different RAM

 

[Lafong]

Amazon.com

That apparently is the above Crucial DDR5. A kit of 2 sticks; 64 gb total.

You say "I unmounted components, switched RAMs and then it restarted to work."

What.....exactly...........did you switch? I'm having trouble parsing that sentence.

 

[gtsolid]

I swapped them. A in B and B in A (at this point I got some trouble with signature and BSOD). Then i mounted them one by one and the system worked. Finally put them in the original places and it started to work