Windows 10: Error sign: No boot disk has been detected or disk has failed on my pc window-8

Can’t turn on pc because error :No boot disk has been detected or the disk has failed Message on my blue screen

:)

 

Error: no boot disk has been detected ot the disk has failed.


So, after about 2 weeks of experiencing Windows 10 I've decided to revert back to Windows 8.1, since I was more experienced at it. So I followed every step to downgrade the system, waited for about a few hours, then I noticed that when Windows restarted, it somehow went to an "automatic repair" loop. I've tried literally everything there was so I can get it running again, but nothing seems to work. But, there was only one option, in which I feel like an idiot to try out.

I went to Command Prompt and typed in diskpart.exe, then enter. I then typed in LIST DISK, then SELECT DISK SYSTEM, and finally CLEAN. Since I thought at the time that CLEAN works like resetting the PC, I rebooted it again, and I came to an error message saying: No boot disk has been detected or the disk has failed.

Is, or will there be any other way to start my PC in a condition like this? If I'm missing any other details then feel free to ask.

 

Hard Drive Disk Error

what kind of a Disk Error is it? does it boot into Windows or whatever OS he has on the PC?

 

USB flash disk error.

Hi
I have noticed that when I connect a USB disk brand ADL four repeated errors appear in Even Viewer of Windows 7. The error is
The driver detected a controller error on \Device\Harddisk1\DR1.
The driver detected a controller error on \Device\Harddisk1\DR5.
But the disk is fine, it have passed the ScanDisk, I have formatted it and the error appears, however it works correctly when I transfer files to and from the disk
Many thanks