Just to make sure - you physically drained the CMOS to reset it, right? That can have different results vs resetting to defaults in the BIOS/UEFI interface.

Did this happen over time or suddenly all ports dead? Or maybe this is new to you and unknown.

I would try clearing the CMOS is you haven’t already. Unplug power, remove the CMOS battery and wait a minute or more (or short the + and - contacts for a few seconds).

If that doesn’t change things, maybe inspect the CPU. Any problems visible on its contacts or the socket?