
If your hard drive is listed as boot drive in the BIOS try this:

Try another hard drive if you have one.Try using a new or known working SATA cable to connect the drive.Try connecting the boot drive to a different slot on your motherboard.

If the hard drive doesn’t appear in the BIOS, it might indicate either the hard drive, cable or IDE/SATA slot might be faulty. If you use an HDD, it should be in ATA/SATA mode. If you use an SSD, check the BIOS is using AHCI mode.If it isn’t, change the BIOS to boot from the drive.Check that your hard drive is listed as the boot device.This can be achieved by pressing the Delete key or F2, it varies by motherboard. Reboot your computer and enter the BIOS.This tutorial assumes you have made no recent changes to your computer that would cause this issue. Fix Boot Device Not Found errors in Windows 10 Rarely does it mean the hard drive is dead and needs replacing. While it may seem serious, it is actually fairly straightforward to troubleshoot in the majority of cases. The Boot Device Not Found error is not something you ever want to see as it means Windows cannot see or access your hard drive. Dave’s Computer Repair Blog – How to fix Boot Device Not Found errors in Windows 10
