I've just bought an Asus TUF Gaming Z590-Plus and can't get my PC to boot while the m.2 SSD (WD Black 500GB m.2 SN750 NVMe SSD WDS500G3X0C) is in the third m.2 slot (M.2_3). No bios no nothing. It'll boot fine in the second slot though (M.2_2). The third slot is smaller and I'd rather use that if I can.. I've read in the manual that they both support PCIe and SATA and I'm aware of the shared SATA ports (none of which I'm using) but for it to not boot at all I must be missing something?