Microsoft has started rolling out new Secure Boot certificates that will automatically install on eligible Windows 11 24H2 ...

No one who assembles a PC or sets up a new computer can avoid the BIOS or UEFI. That’s where you define the basics, from the boot sequence and memory profiles to security features like Secure Boot.

Its probably just the boot order. Go into the BIOS and make sure its trying to boot from the correct hard drive first. If you aren't sure what drive you are supposed to boot from, just switch whatever ...