It is a Windows 10 error.   Try enter bios (press F2) and load default settings, save, exit.

If error still there, I would do a fresh clean install of Win10 (wipe hdd).

Drive is likely still alive but CMOS Battery Duracell DL2032 is bad.

https://docs.microsoft.com/en-us/windows/client-management/troubleshoot-inaccessible-boot-device

Replace Cmos battery then try setting defaults.

IF default doesn't work try setting SATA OPERATION to AHCI instead of Raid.
Options for Mini Tower and Desktop:
RAID Autodetect/AHCI (RAID if signed drives, otherwise AHCI)
RAID Autodetect/ATA (RAID if signed drives, otherwise ATA)
RAID On (SATA is configured for RAID on every boot)
NOTE: When in Autodetect mode, the computer configures the drive as RAID if a RAID signature is detected on the drive.
Otherwise the drive will be configured as AHCI or ATA.

Inaccessible boot device STOP 7B is a windows message.

https://www.amazon.com/Fresh-Duracell-DL2032-Lithium-Batteries/dp/B016KQYM8I

Where I live grocery stores and Walmart etc carry this battery its labelled for medical devices but works fine. Used in blood sugar meters.