Windows 10: How to return win 10 while my instaling win 11 just black screen

Initially, I tried downloading Windows 11 and attempted to install it. After installing, my screen turned black, and now I don't know how to revert it back to Windows 10 because my screen is just black. Please help me.

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Win 10 Can't boot stuck in black screen with blinking cursor

Yesterday suddenly win 10 stop , then return blue screen with the message win need to repair and we will restarted for you , then win boot into black screen with blinking underscore .
I try to boot win from usb to use repair but it's return cant repair your pc , then through cmd in troubleshooter from usb I use list disk and its return
DISK 0 Invalid and its dynamic .
What should I do I hope the hard disk is not dead yet any suggestions please ??

 

Win 10 Completes Install But Returns to Win 7

Downloaded/ran Windows10Upgrade9252.exe. Goes all the way through the verification process. Starts installing Win 10. Win 10 "installs" or gets to 100%. Next thing I know screen goes black with Restoring to Original OS at the bottom!

New PC. First time use stuff completed.

All updates that were available for Win 7 Home Premium have been done (SP1 installed). Shows Windows activated.

No Win 10 Update Icon, but why the notification that Win 10 is being installed then return to Win 7?

 

Win 11 black screen boot after using DDU

Can't boot into safe mode. Tried the above steps but I only get black screen.

How do I do a fresh install of Win 11 if I can't see anything nor boot into BIOS to change startup order to usb?

I don't have another PC to test the GPU.