Unable to boot; 0xc000000f error

Bit of a long story here, I will try and keep it simple.

I recently upgraded the following components on my computer.

motherboard MSI 870a-g54 --> ASRock Z370 Killer SLI/ac RAM: Corsair XMS 4gb + G.Skilll Ripjaw 8gb --> 16 gb Corsair Vengeance LPX CPU: AMD Phenom II 965 --> Intel i5-8400

I did not take any measures with the operating system before swapping components, other than making sure to link my Windows 10 account with my Microsoft account.

After the change, the motherboard booted up, I was able to enter the BIOS without any trouble, but attempting to boot into Windows 10 I encountered a black screen with a 0xc000000f error.

All the drives connected (there are three) and the DVD drive are recognized in the BIOS. I have tried only leaving the boot drive connected, but with no change. I have a boot USB with the Windows 10 ISO file loaded onto it. I am able to load into Window Repair from the USB drive.

When I opened the Registry Key system via the Command Line, all three drives were listed and accessible in the file explorer (I didn't end up changing the registry keys at all, but it was a possible fix I had read about).

I also discovered that my old drives were all partitioned with MBR, not sure if that is causing problems or not, but my understanding is the enabling CSM compatibility in the BIOS should address that. Not sure.

Here are the things that I have tried:

Startup repair - said couldn't repair it.

Restoring to previous restore point - Appeared to succeed, but no improvement

Rebuild the BCD - this was attempted through the command prompt accessible via the Window Repair screen. During the process, the windows files were detected, but I couldn't change them because it said system could not be found(?).The only effect this had was to add "File: \BOOT\BCD" to the black screen o' death. Not sure that was an improvement. During the process, the windows files were detected, but I couldn't change them because it said system could not be found(?). Also tried the advise found here (https://www.kapilarya.com/how-to-fix-error-0xc000000f-the-boot-selection-failed-because-a-required-device-is-inaccessible), but it did not work (either not applicable in case of RAW vs NTSF formatting, and unworkable in the case of the second suggestion because of the error mentioned above, i.e. when attempting to "Add installation to boot list" it said system not found). Running bootsec.exe /nt60 is apparently what caused the aforementioned "File: \boot\BCD" to show up.

Upgraded BIOS to latest version - no improvement

Made sure boot order listed SSD with OS on it first.

Made sure the CSM compatibility was enabled in the BIOS boot system. Tried reinstalling the old Motherboard/CPU/RAM combination in order to remove the files I wanted to save, or see if I could change anything to make it more likely to work, but I encountered the exact same error. Which is weird.

I could go for a new reinstall of Windows after reformatting the drive, but I'd like to avoid that if I could obviously. Anyone have anything else I could try? I've been going at it for four days now, with no success. Any help appreciated.