What to do when reboot and select proper boot device appears when the computer is turned on
This is generally the reason: the hard disk is not set as the first startup item
Method: The first startup item does not select Hard drive
1. When the computer is turned on, press the corresponding key to enter the BIOS (different brands of computers may have different keys to enter the BIOS), select [BOOT] to boot (or start) → [Boot option Priorites] boot order, whether the hard disk is the first boot item.
2. Press Enter. If there is a hard drive (Hard drive) option, set the hard drive of all systems as the first startup item, then select Exit, and click Exit & Save Changes (it may also be Save Changes and Reset or Exit Saving Changes, means exit and save). Just restart the computer.
---- Yan Haobo 2021/3/30