Hi, yes, SOLVED.
It turned out that CPU socket had few bent pins (https://prnt.sc/jcBk5FZsRFE1) - local service found them.
Not sure, did it come from ASUS or I somehow managed to damage them on first assembly.
ASUS refused to replace it on warranty (ok, maybe fair) and support was one of the...
I am not so sure after latest find - every time I install latest ME firmware (utility does not check if same version is already installed), reboot works fine! (while any other scenario - OS restart, exit from bios - still fails)
I have already stated that I reinstalled Windows, on different NVMe drive, on different M.2 slot, without changes. Also problem occurs by simply exiting from BIOS, so it is not an storage/OS issue. It is a new build.
UPDATE: So new BIOS version (1205) came out today - only 5 days after last one, so - oh, they may have found a bug. Also corresponding ME firmware (16.1.27.2176v2_S) was out.
So I installed ME first - and when it forced the restart, computer booted fine for one single time. BIOS update did not...
Power supply replaced with Be Quiet! 750W, including 2x 8-pin CPU connectors (previously only one was available). No change - after restart, blank screen, no POST.
Thanks. NVMe firmware updated & tested. Same results.
Actually - storage can be removed, same issue remains with exit from BIOS - no POST until cold restart.
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I will try to get my hands on other power supply but really doubt it will help (power supply is few years old and have been working...
Specs:
Mobo: ASUS Prime Z790-A (new)
CPU: i7-13700K (new)
RAM: 2x16 DDR5-6000 (G.Skill F5-6000J3636F16GX2-TZ5K) in A2, B2 slots
PSU: 700W Thermaltake
Cold start works perfect, fast, Windows launches, no crashes.
Q-LED sequence: Red -> Yellow -> White -> Green -> POST + BOOT
However, normal...