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See these links:
Enable or Disable Fast Boot in UEFI Firmware Settings for Windows
Boot from USB Drive on Windows 10 PC
You may need to reset the BIOS:
How to Clear Your Computers CMOS to Reset BIOS Settings:
How to Clear Your Computer’s CMOS to Reset BIOS Settings
3 Ways to Reset Your BIOS - wikiHow:
3 Ways to Reset Your BIOS - wikiHow
3 Easy Ways to Clear CMOS (Reset BIOS)
How to Clear CMOS (AKA Reset BIOS Settings)
What are the status of the important computer files:
a) files backed up to another drive or the cloud
b) backed up images saved to another drive or the cloud
c) no backed up files or images > files need to be saved
d) no backed up files or images > files do not need to be saved
Please perform the following steps:
1) Find 2 or 3 flash drives that you can format (> or = 8 GB)
2) Make tools that can be used to recover important files, test the drives, and troubleshoot
3) On a working computer create:
a) a new bootable windows 10 iso 20H2:
https://www.microsoft.com/en-us/soft...load/windows10
Download Windows 10 ISO File
Download Windows 10 ISO File
Create Bootable USB Flash Drive to Install Windows 10
Create Bootable USB Flash Drive to Install Windows 10
b) bootable Ubuntu flash drive:
Create a bootable USB stick on Windows | Ubuntu tutorials
Create a bootable USB stick on Windows | Ubuntu
Linux to the rescue! How Ubuntu can help a computer in distress | PCWorld
c) Run Sea Tools long generic test
Post an image of the test result into the thread
https://www.seagate.com/support/downloads/seatools/
How to Upload and Post Screenshots and Files at Ten Forums
From a cold start,do you get any part of the bios on screen?
If so,then immediately press ---Pause/Break--- key to allow access and see if that gives control.