Native Boot install won't start after moving disk (external USB to internal SATA)


OK, this is my last post in this thread, because I just can't get my points across. I really do appreciate all the help/suggestions, but this is NOT a bootloader problem. If I make any changes to my BIOS, regardless of what they are, I can get my internal SSD-based Linux and Windows Native Boot systems to load. After the next cold/hard reboot, the disks just disappear. They do exist, of course, after I load any system that's installed on the NVMe or external USB disks; all partitions are available, no disk errors. I've already reloaded/resest both Windows Boot Manager and GRUB, both fail the exact same way: the disks just aren't there.

The only thing I've not tried is removing the NVMe disk and trying to install on one of the internal SSDs. But it's just not worth it.
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom
    CPU
    Intel Core i5-13400F
    Motherboard
    PRIME B760M-A
    Memory
    32 GB
    Graphics Card(s)
    Nvidia 4060
    Sound Card
    On-board
    Monitor(s) Displays
    (2) Acer XD270H B
    Screen Resolution
    1920x1080
    Hard Drives
    (1) M2 1TB
    PSU
    600W
    Case
    Tower
    Cooling
    (3) Case fans
    Keyboard
    Standard
    Mouse
    Standard
    Internet Speed
    250 Mbps
    Browser
    Vivaldi

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