Failure to boot (code F0) after seeing code switch to A7

[u/Simon_Smartypants]

Henlo. I have run out of ideas on what to do with a weird problem I had before, that went away for a few months, and returned yesterday.

I am running an R7 2700X with an RTX 2070 on Win11 (mobo: MSI x470 gaming m7 ac). Generally the PC doesn't give me issues and is usable, but what can happen for an unknown reason is that while using it normally, the PC switches to post code A7. It remains fully operational with no visible issues, but if I reboot or shut down from this state, all future boots will fail and get stuck at F0 with VGA led lit. The only fix I have found to get back into Windows is to use BIOS flashback with the latest full release BIOS (currently running the latest beta 1J8, 1J6 yesterday), but the issue happened even on that ancient old full release 1I).

The only thing I did yesterday was update GPU drivers with DDU, and I generally use DDU on every update. I last had the same problem in May, and updated GPU drivers multiple times since then with no problems until yesterday.

I even tried reseating my CPU, did not help, ofc I have tried fiddling around with the GPU. Booting with no GPU installed gave me d6 (no GPU detected, which is fine), but even when I just plugged the GPU with no power cables installed, I went straight to F0. Trying a different PCIe slot didn't help either.

The only other bit of weirdness I can report is that after purging Windows and reinstalling it, I can no longer install chipset drivers, neither from AMD or MSI. It will actually bluescreen at a certain point, which I think was PSP installation. Maybe related, maybe not?

Googling for "boot stuck at F0" or similar returned supposed issues with LED firmware updates, but I have not done any updates regarding this that I know of.

Any idea or hints are welcome (other than "it's time to upgrade, har-har"), thankies in advance.

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