Yeah... contemplating that myself. I don't want to re-rebuild yet again, but may be the only option. I'd love if there were a firmware solution forthcoming, but I know better than to hold my breath waiting for it.I did not try an old SSD. That's interesting. However, I still would have sent it back even if I discovered that work around. It's still defective and I prefer using M.2 drives.

You can do a quick test just by taking the M.2 drive out and trying to boot with no drive at all. If it's the same issue I had, it'll get to the BIOS at least and you'll have a better fix on the issue without having to scavenge another machine.I may give this a try just to see, just to have it confirmed on 2 boards! My sister has a sata ssd just sitting in her pc I may borrow for the test. although after putting everything together 3 times now I'm not looking forward to doing it all over again!
I went with a gigabyte aorus elite ax after. Sorry PaulieG, literally the first board you said you had trouble with and I got one. Runs well so far, but I haven't tried overclocking the memory or anything except for the GPU just a little bit. Running a cool 2666mhz on the 10th gen intel. It was cheaper than ones you mentioned, and the wifi Steel was not in stock. Glad to hear the Asrock is the running, and def agree with you about the fact the Asus board is still faulty out of the box, and m.2 is def the way of the future. I wonder if it would be the same problem with the m.2 on the pcie 4.0. slot, with compatible cpu, ssd?
I would also like to mention trying on a separate breaker, I'm an apprentice electrician, and bought a house that was a fixer upper to say the least. I know there's one 15 amp breaker that powers at least 12 outlets/lights one of those plugs in my room, and I tested the pc on a separate 20A circuit I have in the basement shop for tools just incase that was an issue and still encountered the same problem. As Nater said it was grasping at straws at that point.
I'll update if I get around to trying the asus with the sata ssd this weekend! Good catch there DashielN