Solution to reboot and select proper boot device

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Solution: 1. Check the boot device order setting of the computer; 2. Make sure the hard drive is connected properly. If the connection is loose, please reconnect it and make sure the connection is firm; 3. Try to reset the BIOS settings and restore them to default values. ; 4. Use another computer or portable device to connect the hard drive to another computer and see if the files in the hard drive can be read; 5. Reinstall the operating system or use operating system installation media to fix the boot problem.