When you remove the external drive, your computer doesn’t find any bootable drive to boot with. The other reason might be you would have connected the external bootable media drive such as DVD or USB drive to install the operating system, and you set this external media drive as default bootable media in the BIOS settings, or this external media drive got set as default itself as default bootable drive. If you’re trying to boot your primary OS from the hard drive, but you’re getting the error “Reboot and select the proper boot device,” The reason for this is simple, either the hard disk is not working, or no bootable disk is selected in the system’s BIOS boot settings. Understanding the reasons being this problem is very crucial. No Operating system is selected in the BIOS boot menu Understand the reasons behind this error 1.
In this guide, we will walk you through some troubleshooting steps to fix this error. The solution for this issue is quite simple, but there might be various reasons for this error to occur. When no external bootable media drive such as DVD or USB is connected, the reason for this error could be either hard disk where the operating system is installed is not working or in system BIOS settings, no bootable media drive is selected to boot the operating system. When you boot your computer, the system BIOS boot the operating system from the mounted bootable drive. There might be various reasons for this error.
Generally, this problem is related to Bootable drives such as HDD, SSD, DVD, and USB Drive.
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