Your hard disk (HDD) must be listed in your computer’s boot order The causes for this error might be any of the following: Symptom 1: “ Reboot and select proper Boot Device” error screen on startup The error messages, alerts, warnings, and symptoms below are tied to this error. The following information on this error has been compiled by NeoSmart Technologies, based on the information gathered and reported by our global network of engineers, developers, and technicians or partner organizations. About “ Reboot and select proper Boot Device“