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Alright good work on finding a solution

It can also be named Memory Reference Code, so search for something like that. or Memory fast boot or Memory Context Restore. Different motherboards can have different name for it.

I don't mean Fast boot, that's a whole different thing. There should be something called MRC fast boot. Don't you have a search field in bios? Expo is what AMD call their ram overclock profiles, similar to Intel's XMP. Turning it off makes the ram run at default speed, but it might be more stable then. And like @leclod said, it's quite overkill and an unusual ram amount. For a...

You could try to turn off MRC fast boot if you search for it in bios. That will make it memory train the ram. If you have Expo on try turning it off. If possible try the ram sticks in another pc and do a memtest just to be sure. Borrow a friend's pc if you don't have a spare.

It sounds like either a fan or the head of a harddrive, but you didn't mention any harddrive in there?

There are some issues with the Western Digital SN770 and the latest Win 11 24h2 which can give bluescreens. You can read about it here. https://www.hostzealot.com/blog/news/how-to-fix-blue-screen-on-windows-11-24h2-due-to-ssd-issues And also what @Hinjima already mentioned, pick another PSU that isn't from Nox. https://cultists.network/140/psu-tier-list/

See if you can borrow a friend's PSU to test with for awhile before you decide to buy a new one, just in case.

Are there any suspicious error or warning messages in the event viewer, especially at the time when it happens? Are there any warning signs or something odd in the device manager? Have you checked for any corrupt system files? Open a command prompt as admin and do a sfc /scannow Have you checked the health of that Kingston ssd? If it has been used since 2015...

Have you tried reinstalling Easy Anti-Cheat? There should be a folder, probably in the folder with the game, where it contains EAC software that you can run and select repair.

Did you do a proper troubleshoot? Atleast have you tried with a different cpu? If you don't have a spare ask a friend to borrow his cpu to test with. Don't get suprised if the new motherboard doesn't work, with your cpu.... Inform yourself about the Raptor lake degradations. There are plenty of articles and youtube videos about it.

Are you sure you got a new one back? It could be just the first drive sketchy refurbished?

What happens if you turn off the WiFi? Does that enable LAN? You could also try using the Device manager, go to Properties for that ethernet card and into the tab power saving functions. Uncheck the power saving features to see if that helps.

You could take a look at the SSD tier list Personally I use a Kingston fury renegade as OS drive and it works well

Maybe it had rust on other parts of the card aswell but he managed to remove it. You said that he told you to use sandpaper, so that could mean he has done so himself, from his own experience. Then thought it wouldn't matter if there's rust on the backpanel and just ignored that piece. Why not just ask the seller about the rust? Why it got there? If he has already...

Looks like it has been in a sketchy water cooled case, I wouldn't risk it...