Windows 10: Startup Error Message : Inaccessible Boot Device

Since this yesterday, whenever my PC is turned on , the following error message appears:



Your PC ran into a problem and needs to restart. You can restart.

If you’d like to know more, you can search online for this error : INACCESSIBLE BOOT DEVICE



However, when I restart by pressing the RESTART button, it starts to do an automatic repair but the process repeatedly fails as does all other recovery options. I cannot even Refresh or Reset and it is not even possible to re-install Windows with all files and settings intact.



What could I have done wrong and is there a way to fix the problem or do I have to format the hard drive and re-install Windows afresh which will mean that all my files and settings will be deleted. Can someone please help?

:)

 

INACCESSIBLE BOOT DEVICE error in BSOD at startup


Been a busy few days... but, as I suspected, the tests reveal no hardware issues.
Memory Test




HDTune tests










Seatools Test




Chkdsk Test of the C: boot partition was ok, but I messed up getting the log, and blurred the screen photos. Sorry. After successfully completing all 5 stages, with no file system or other problems reported, the message was:-
"Windows has scanned the file system and found no problem.
No further action is required"

I took a complete backup of all the partitions on the drive, so the data is safe. I'd like to know if there is a way to save/restore the apps and settings (as referenced in my original post) if I have to do a reset or re-install?

I appreciate your help axe0. Looking forward to how best to proceed....

 

INACCESSIBLE BOOT DEVICE on startup

 

Inaccessible boot device


I'm not sure if this is helpful, but maybe you can have a try. Windows operating system backups a working registry for recovery purpose. You can perform registry backup restoring to fix the inaccessible boot device error. The pre-condition is that you can access to the Advanced startup opotions of your PC. You'll need to use the command prompt.
Also, steps are a little bit complicated. However, if you follow the guide strictly, no mistake should be made. You can Google how to restore from Registry Backup, or refer to this article for help. Inaccessible Boot Device Lenovo.
Regards.