MSI X399 hanging on debug code 60

[Wyon]

Around a year ago I built a threadripper system to use as my unraid server.

MSI X399 Pro Gaming AC Carbon, 2920x, 48GB of G.Skill TridentZ RGB 3200 Ram, 1tb Intel 660p, and gpus and hdds.

It ran perfectly fine for around 4 months until I came home to it frozen. I hard-rebooted it and now it hangs on debug code 60 which is "dxe core is started".

I've tried it with 1 stick of ram, no boot devices, different gpus, resetting cmos, flashing bios using flashback. The only thing I haven't done is replace the cmos battery. I've since RMA'd the board twice and both times nothing has been fixed. I get no support email asking questions or explaining anything. Basically I've just wasted $50 on shipping. So I've come here looking for some help. Any ideas come to mind on what could be causing me issues?