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A few months ago, with seemingly no reason (no hardware changes or incidents) my wife's gaming PC started pausing for 60 seconds+ before POSTing with the VGA fault light on. I tried everything, swapping GPUs, updating / resetting BIOS, replacing the CMOS battery, re-seating RAM and even the CPU itself, nothing worked. But it always POSTed, eventually. It's like it was memory training every time.
A few days ago it just stopped doing it, POSTing immediately like it hasn't done in months. WTAF
It makes me wonder whether Windows updates could cause / resolve something like this. I always assume the BIOS/POST sequence is too isolated for that to be the case, but with UEFI there's much more access from the OS - to the extent that updating a BIOS can now trigger a process in Windows on next boot (like asking you to install motherboard software). And I remember that Windows malware that could exploit your BIOS boot image. So perhaps it's possible?
@sinbad I have a Dell at work and I occasionally see a bios update in the Windows Update list. Not sure which other brands would want to pay to be included in Windows Update.
@jkaniarz SteelSeries include driver updates in the Windows Update list, that's the first time I've seen a 3rd party who told me to go there for drivers. This is an MSI board and looking at their tech support their *laptops* do have BIOS updates via Windows update. I had to update the BIOS itself manually, not that it made any difference. It's like there's something in the higher layers of the BIOS/UEFI or something that Windows can affect