Windows Wont Boot Up At All (Black Screen Problem)

Hello people of Tenforums, this problem has been persisting since early October and still have not come up with a solution and neither have other forum sites. Windows one day just stopped booting when I accidentally, and unknowingly, added EXT4 file type volumes onto my hard drive using 'Linux File Systems for Windows by Paragon'. Windows tries to boot but nothing but a black screen appears and then takes me back to the UEFI bios menu.

Windows has refused to boot up ever since and I've even tried some chkdsk commands, 'bcdboot c:\windows /s c:', and even deleted the EXT4 file type partition (along with an unknown windows partition, and EXT4 Windows Recovery Environment Partition).

Nothing has seemed to work. I've moved all my valuable files off my c: drive and ready to just install a fresh boot of windows at this point. What do you guys think? Windows Version number is 10.0.19041.1 btw. This post may be too deficient, and I'm sorry, I will add anymore information, just ask. But was just hoping someone who knows about Linux and Hard Drives could maybe come up with an explanation, or solution, as to what happened. Thanks to everyone who replies in advance, it means a lot. :)

Could you clarify the situation?
If Win 10 will not boot,what did you use to run chkdsk,delete files and transfer files from C ?
Because you deleted an---unknown Windows partition---among other actions,perhaps the better solution would be a clean install.
If possible,in future, back up to an external drive,Macrium Reflect is an ideal method and keep a recovery usb stick handy.
Mixing linux with Windows,can be problematical.

I would just reinstall windows. Create a restore point, then install paragon and see if it works.
Your issue may be entirely unrelated to Paragon.
Also if you could keep your windows system on one drive and Linux on another that is better I think.
I have dual booted between Linux and Windows simply by changing the boot order before. Now it is harder to do that maybe since windows takes over and maynot be able to hit a key and select which drive to boot with uefi.

joeandmarg0 said:

Could you clarify the situation?
If Win 10 will not boot,what did you use to run chkdsk,delete files and transfer files from C ?
Because you deleted an---unknown Windows partition---among other actions,perhaps the better solution would be a clean install.
If possible,in future, back up to an external drive,Macrium Reflect is an ideal method and keep a recovery usb stick handy.
Mixing linux with Windows,can be problematical.

Thanks for replying! I was going back and forth between using a Windows recovery usb and linux ubuntu usb to look at the partitions, then I think I may have deleted a valuable windows partition on linux ubuntu not know what it was... and yeah a clean install is prob my best choice tbh. Just looked into Macrium Reflect and that looks like a very reliable way to backup my hard drive in the future! Thank you so much for your suggestion!

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sdowney717 said:

I would just reinstall windows. Create a restore point, then install paragon and see if it works.
Your issue may be entirely unrelated to Paragon.
Also if you could keep your windows system on one drive and Linux on another that is better I think.
I have dual booted between Linux and Windows simply by changing the boot order before. Now it is harder to do that maybe since windows takes over and maynot be able to hit a key and select which drive to boot with uefi.

Yeah I'm thinking that;s for the best. Would reinstalling Windows repair the boot partitions or would it do it on its own? I followed some guides and rebuilt the efi and mbr (MSR?) partitions yet Windows still wont boot. I keep getting an 0xc000000f error now. Do you think reinstalling Windows would help with this?

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Megahertz said:

The EFI Fat32 partition has the boot loaders. No only Windows but also Linux boot loader.
On a UEFI Boot, BIOS transfer the boot sequence to the EFI Fat32 partition that will transfer the boot sequence to the windows partition or the Linux partition.
If you have format the EFI partition as ext? (a Linux partition format type) it won't boot, first because it is not Fat32 and second because it is blank.
You can boot from a Win 10 installation disk and rebuild the Efi partition.

On the CMD bellow you have to adjust the partitions numbers and the drive letters. DON'T just copy and paste

diskpart
list disk
select disk 0 (select from list disk)
list part
select part 1 (select from list part - EFI)
delete part override
create part EFI
format fs=fat32 quick
assign letter=w
list volume (take note the windows drive letter)
exit
bcdboot G:\Windows /s W: /f UEFI (replace G with windows drive letter)
exit

Brilliant! You're right on the dot. I tried following these two tutorials ( Repair Windows Boot Partition | Includes files and partitioning - YouTube / Repair Windows Boot Partition | Includes files and partitioning - YouTube ) and Windows booted up, finally! except I got a blue screen error code 0xc000000f. I searched it up on google and apparently, yeah you're right, the EFI partition needs to be fixed. I then tried following this tutorial ( How to Repair EFI/GPT Bootloader on Windows 10? | Windows OS Hub ) and it hasn't worked. The command prompt from the installation usb stick isn't saving any commands. I tried to assign a different letter to one of my partition's and turned off the pc only to turn it back on and see nothing has been changed. I'm just about ready to just reinstall Windows 10 at this point but what would you suggest if you were me? Thanks again for your feedback, seriously. You and all these other brainiacs are what make this forums so great, THANK YOU THANK YOU THANK YOU!!!