After my troubles, I would say memory.
Nope I started seeing also: "Over current on USB shutting down in 15 seconds to protect MB", MSi support saw a screen shot said bad MB return, sounded like it is a know problem as they did not even blonk just said bad MB. Ok fine, but there are none in stock and so now no MB for weeks
I did track down the 33 and 31 errors, MB would not boot unless Video card was present and connected to a monitor, never seen the like, it hung unless I connected a DVI or DP cable to a monitor, and the USB-C to DP did not seem to work at all, hence the hang without Video card installed, may have been related to the USB over current, but still what was teh point of having a built in to debug with if it does not work.
So a week to get the MB, 2 days to setup the system cleanly and get it started, 6+ hours of hell fighting with it and right back to MSI for replacement, which could take 20+ days
One last majorly annoying thing is Windows does not find any NIC during install so have to side load a driver or do so after install, which is petty 90's, in fact I never got so far as booting Windows and getting online with the MB always got USB warnings or cut outs first.
ERIC