So, I just build a brand new unraid server.
Motherboard has 6 SATA slots, and with disks connected to the motherboard, everything works OK.
Motherboard is brand new Socket 1700 MSI - PRO Z690-A WIFI (MS-7D25) with a i7 12700K intel cpu and 64GB ram.
I then bought a PCI-E 4x 3.0 Sata card, and no disks shows up.
I have tried all PCI slots, but no dice.
I've also set all pci slots to AUTO in bios.
I bought two of these, and none of them works, so HW failure on two cards are unlikely.
I've attached Diagnostics.
I really don't know what more to try.
tower-diagnostics-20220419-1146.zip