Instead of taking it to the repair shop
How to Fix Reboot and Select right Boot Device or Insert Boot Media in selected Boot device
The error message "Reboot and Select Proper Boot Device" appears when the motherboard cannot connect to the hard drive containing the operating system.
But there is no need to take your PC for repair. In this post, you will learn how to fix the problem yourself.
First check the cables to see if they have become disconnected from the motherboard or hard drive.
