[SOLVED] Is my motherboard fried? Partially boots, laggy BIOS, strange glyphs.

[BookOfNostradamus]

My PC is behaving very strangely, I'm trying to figure out what's wrong. I suspect the motherboard is fried, but I'm not sure, and I'd like to determine exactly what the problem is before I sink time and money into replacing a part.

Operating system is Linux Mint 19.

Behavior

• When booting into BIOS, the mouse input would stop working every other second or so
• When booting into GNU GRUB, the keyboard input is similarly periodically unresponsive
• When attempting to boot into OS, a few times I've gotten this glitch visual:
  View: https://www.youtube.com/watch?v=aNZxljasVoA
  
• Other times when attempting to boot into OS, it power cycles in a loop without ever showing something on screen
• One time upon booting up, it went to this very strange looking glitch visual:
  View: https://www.youtube.com/watch?v=cpwpro43L2o
  
• I booted from GNU GRUB into memtest, and it ran the whole suite for a couple hours without showing errors:

Main Specs

Motherboard	MSI x399	https://pcpartpicker.com/product/Wf...atx-tr4-motherboard-x399-gaming-pro-carbon-ac
CPU	Threadripper 1920X	https://pcpartpicker.com/product/cRDzK8/amd-threadripper-1920x-35ghz-12-core-processor-yd192xa8aewof
Graphics Card	Gigabyte RTX 2070	https://pcpartpicker.com/product/CG...2070-8gb-windforce-video-card-gv-n2070wf3-8gc
Memory	G.Skill Ripjaws V 2 x 16 GB DDR4-3200	https://pcpartpicker.com/product/kXbkcf/gskill-memory-f43200c16d32gvk
Power	EVGA SuperNOVA G2 750 W	https://pcpartpicker.com/product/MfJwrH/evga-power-supply-220g20750xr

I'd really appreciate help

 

[velocityg4]

I'd suspect the video card as the most likely culprit. I'd start there and swap it out with a known good one. Hopefully, you have an old one laying about. You can also try pulling one RAM module at a time. In my experience visual glitches are most often the GPU.