Windows 10: BSoD & boot order changes by itself in BIOS

Two issues happening at random times:BSoD"An operating system wasn't found" during startup. When I look into the BIOS, sometimes the boot priority changed by itself to the drive with no OS Samsung SSD 850 Pro 512GB , sometimes the hard drive with OS completely disappears Samsung 970 EVO 1TB M.2 NVMeTroubleshooting tried so far:No dump file created after BSoDchkdskMemTest86Latest BIOS flashedLatest drivers GPU, WiFi etc.Samsung Magician SSD management utilityBIOS battery voltage is 3.2vScrews/cables not looseFormatted hard drive before reinstalling OSNo overclockingConfig:Both Win 10 and

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Can't Change Boot Order

Cloned original C:\ drive to an SSD drive then followed the windows procedure to get to BIOS to change the boot order:

• Settings
• Update and Security
• Recovery - Restart Now
• Troubleshoot
• Advanced Options
• UEFI Firmware Settings
• Restart

The last restart does not take me to BIOS. I just get a blank screen. Esc key gets me back to Windows, but I don't want to format the original C:\ drive for other use until I am able to change the boot order. How do I do that?

 

Changing BIOS

Hi Phil

Do you now have another internal hard drive that you want to boot from or are you actually trying to boot from that external HDD?

When you boot your system into BIOS, on the boot order list can you not move the drive you want to boot from to the top of the boot order List?

If you have UEFI BIOS - you may need to temporarily disable Secure Boot to change the boot order, then restore Secure Boot . ..

 

Boot order in BIOS is changed to a USB but restarts keep going to Windows

So here's a riddle.

-I have a PC set to boot off of a USB regularly instead of Windows to access a Linux work environment.

-The drive is set up to boot with UEFI, created using unetbootin

-BIOS is modified to have USB hard drive/USB flash drive at the top of the UEFI boot order list

-Secure boot is disabled

-The system boots to the drive without issue after changing these settings

-The system boots to the drive after rebooting from that environment without issue

-I shutdown the PC and pull the drive out, then boot up when I want to use Windows

-After inserting the drive, I reboot from Windows, the system keeps booting back into Windows

-I assume the drive has a bad connection, but I'm able to see the drive is recognized in Windows

-I assume the system is just not entering the right power state in this process, so I hold down the power button and do a hard reset. The system continues booting into Windows.

-I assume Windows is actively changing the boot order or re-enabling secure boot(which I can probably prevent with a BIOS password)

OR

-I assume the BIOS is forgetting the drive and reverting the boot order

OR

-I assume the CMOS battery is defective and the BIOS is reverting to defaults

BUT

-When I go back into the BIOS settings, USB hard drive/USB flash drive is at the top of the UEFI boot order list and secure boot is still disabled.

-I ignore changes and exit the BIOS, suspecting an issue with the drive itself.

-Every time I exit the BIOS like this, the system boots to the drive without issue.

-I still strongly suspect this is something with the power state not going down to the proper level, which is why I'm reaching out here rather than with the BIOS manufacturer.

Appreciate any thoughts.