Upgraded system, no longer can establish a connection

[Tisrok]

I just switched from a very old intel build to an AMD fx8350 along with an MSI 970 gaming motherboard. The components are all working as they should be except there are no link lights/no connection when using the ethernet port on the motherboard.
Using a USB ethernet dongle, I can get link lights, but still can't establish a connection.
Verified that the LAN controller is enabled in BIOS.
Giving the command "ifconfig eth0" pulls device not found.
"ifconfig" with the dongle connected shows a "br0" device but it pulls a totally wrong IP (wrong subnet)
The furthest I've tried is editing the network config file and manually setting a static IP but that didn't work either.

I'm not a linux user so I have no idea how to manually fix the issue. If I had to guess I'd say driver issue but there aren't any official MSI drivers for linux.
Any help would be greatly appreciated.

Edited May 25, 2021 by Tisrok
Additional information

[trurl]

What  version Unraid? 

[Tisrok]

24 minutes ago, trurl said:

What  version Unraid? 

Latest version as of today.
Furthermore, "ifconfig eth0" says "device not found"

Edited May 25, 2021 by Tisrok
Additional information

[JorgeB]

Type "diagnostics" on the console and attach the zip here.

[Tisrok]

20 hours ago, JorgeB said:

Type "diagnostics" on the console and attach the zip here.

Thanks for the reply. The network issue somehow resolved itself after a few reboots (no configuration or hardware changes...). I'm now having other issues with starting the array and crashing, but that'd be for a new thread.