Additional info: rereading the mobo manual, I realized I had plugged the HDs into SATA 3 and 4. When the C: drive is connected to SATA 1 and to SATA 2, the machine doesn't even get as far as the BIOS.

When I try to access the boot menu, I get a message saying, "The system cannot find any bootable devices." The machine runs (or at least, ran) Windows 10, without any difficulty. The GPU is the only ...

Secure Boot certificate expiry 2026 arrives June 24 when Microsoft’s KEK CA 2011 expires. Devices missing the UEFI 2023 ...