The BIOS/UEFI settings may be set to prioritize the EFI Shell over your primary storage drive. Secure Boot/CSM Issues:
Think of the EFI Shell as a minimal operating system built directly into your motherboard's firmware. With it, you can: efi shell version 260 512 2021
: Type fs0: and press Enter . If that doesn't work, try fs1: , fs2: , etc. EFI Shell Version 260 512 2021: A Comprehensive
Enter BIOS/UEFI setup → → Launch EFI Shell from filesystem device . Version : 260 512 2021 UEFI Support : UEFI 2
If these steps don't work, you may need to use a (USB) to perform a "Startup Repair" from the Official Microsoft Support page.