If there are multiple drives installed in the computer, then it can create confusion as to which drive has a Bootloader. This scenario usually happens when Master Boot Record is on the wrong drive.
This article highlights the issues that older computer systems will encounter when the Secure Boot Certificate expires ...
Cloned SSD won’t boot? Learn how to check BIOS boot order, UEFI/Legacy mode, BCD repair, SSD cloning issues, and boot ...