I know what the codes mean, I meant I could not verify a certain sequence during boot or reboots.
You seem to have ignored the original situation. Might I suggest you not remove the power from the board and see what it does.. When all power is removed, the system needs to re-read the configuration set in the Bios and then restart to implement those settings, at least that is the way it appears to me. What codes you see during such an event may not mean much.
I also knew where the M.2 drives were, still just a suggestion for testing to remove the non-booting drive. Believe me, I know what a pain it might be since I have changed my NVMe drive 3 times in the last two days .. for testing.
Maximus Z790 Hero,
Intel i9-13900k
Intel BE200