Sorry that I misfired on your issue.
So far I get that you have reset the BIOS, I understand to 'defaults' if I am correct.
Try to update the BIOS even if it the latest/current one. Just reload the BIOS which is different from resetting the BIOS to defaults.
Also, what are your current BOOT MENU options in the BIOS Menu?
Have disabled "Fast Boot" and/or "Hardware Fast Boot"
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