Bios no registra M.2 NVMe SSD
Bios no registra M.2 NVMe SSD
It malfunctioned after you took off your GPU. ... It seems like the mainboard is the issue, as the same problem appeared in the secondary slot. ... If it were a CPU, it would likely have been detected in the first slot.
A few notes here... What RAID or Optane configuration are you planning for? When not using them, switch to AHCI. Your BIOS is currently set to CSM (legacy support) instead of UEFI—try switching to UEFI and check if M.2 bandwidth comes through the Z390 chipset, not the CPU. Like primary PCI-E X16 slots, it should be via the Z390, not the CPU. Changing to Gen3/Gen2/Gen1 shouldn’t impact your setup. You want to use the top M.2 slot whenever you can. The bottom slot shares bandwidth with SATA ports 5 and 6—if you have any SATA SSDs, etc. It’s best to keep it on Auto or set it to Gen3. Make AHCI Mode active, not RAID/Optane like in your photo. These two options should stay disabled by default.