Inaccesible Boot Device error on Windows 10 PC

The customer started getting this last week.  They said they did a system restore to no avail--although I'm not sure how they did so since the computer won't boot up.  Today I helped them restore an Acronis backup image from several days prior, and it said it was successful, but the error persists.  I also had them unplug every USB device except the keyboard and mouse.

So before I have to go "lay hands on it", I'm hoping someone has additional suggestions for a resolution.  Could this be caused by bad RAM--that I might try to have them swap?  Note that it does show "Starting Windows" (or whatever it says) like normal when they power it up, but it always goes to the blue screen with this error.  Any suggestions will be appreciated.  TIA
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Joe FulginitiNetwork EngineerCommented:
Perhaps the bios battery went bad and the system reverted to an incorrect disk mode.  Try changing the disk mode in the BIOS to AHCI/RAID ect.  Had a similar problem the other day.

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Keelyn HenningIT System AdministratorCommented:
The INACCESSIBLE_BOOT_DEVICE bug check usually indicates that the Windows operating system has lost access to the system partition during startup. If this happens, the system usually shuts itself down after showing a Blue Screen or Stop Error to protect itself from probable data corruption or loss.

Here are a few suggestions you can try to resolve the issue. See what applies in your case:

1. If you think a boot device may at fault, you may need to edit the boot options.
2. Remove any recently added hardware.
3. Check if the disk firmware version is incompatible with Windows 10. If not, you may need to update to the latest firmware version. See if you need to update the BIOS.
4. If you recently added a driver, restart your computer, enter Advanced Boot Options menu, select the Last Known Good Configuration option. You may boot Windows 10 into Safe Mode and try a system restore or a Rollback.
5. If you think the cause could be hard disk corruption, Run Chkdsk /f /r on the system partition. If you cannot boot into Windows, use the Recovery Console and run Chkdsk /r or run Chkdsk from the Repair Console.
6. If you just upgraded to Windows 10 and then you are seeing this error, then, download and use Media Creation Tool, using another computer and save it to a USB device. Use it to perform a clean install, by clicking on the setup file or booting from the USB. If you are asked for a product key, click on Skip this step. Windows 10 will activate itself, when you sign in with your Microsoft account.
7. If nothing works, you may have to fresh-install your earlier OS, viz. Windows 8.1 or Windows 7 operating system, activate it, upgrade to Windows 10, activate it and then clean install Windows 10 using ISO.
8. This post will help you if you receive 0x7B INACCESSIBLE_BOOT_DEVICE Blue Screen after Windows Updates.
Some windows updates might have caused this, there were a lot of incompatibilities seen to the january updates, especially if the machine has an AMD CPU. Still, the normal process of analyzing would start with a checkdisk on the c; partition, conducted from the command line of windows setup - do you know how to do that? Boot setup, press shift F10, a command line comes up where you can launch

chkdsk c: /r

(that is, if your drive is not encrypted and c: is the correct letter as seen by setup).
Please ask for assistance if you need it.
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if it does not boot up - i Always inspect the bios boot priority settings, to see if the correct drive is selected
if that is ok -  and it still does not boot, i run disk diagnostics on the drive -  usually it has problems then
sasllcAuthor Commented:
I tried all the hardware suggestions above, but not the software suggestions--since I had restored an image made 6 days before this error ever occurred.  But since the problem still kept happening, I restored an image from 15 days prior, and that actually worked for a while--until Win 10 forced another one of its usual updates, at which point it crashed again.  So finally I restored an image from 22 days prior, and for reasons I don't understand, it now works.  All day long I have been having it search for Windows updates, and install the ones it found, and rebooted repeatedly...and now I can't make it fail.  This makes no sense to me, since by now it has surely installed all the updates that made it fail in the first place.  I guess time will tell.
why did you not post the bios setting for boot priority?
sasllcAuthor Commented:
Because I looked at the boot priority settings and they were correct.
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