Bad Motherboard?

I built a dual L5640 system on an X8DT6-F and for awhile it was running great. One day it started crashing and I had boot problems. I did the normal tear down and minimal re-build with one CPU and one stick of ram.

I can get it to boot and run Unraid with no issue with the one CPU and one stick but the moment I add another stick it becomes very unstable and Unraid will freeze after an hour or so. The video output also started flickering the other day regardless of whether i use an external or on-board CPU so when I get into the BIOS I can’t do anything or check anything

This has to be a bad Mobo, right? Anything else it could possibly be?