Reboot and select the proper boot device in Windows 10

When you boot your computer you may meet the error that shows the message “Reboot and Select proper Boot device or Insert Boot Media in selected Boot Device and press a key”.

Reboot and select proper Boot Device

Generally, this problem is related to Bootable drives such as HDD, SSD, DVD, and USB Drive. There might be various reasons for this error. When you boot your computer, the system BIOS boot the operating system from the mounted bootable drive.

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.

The solution for this issue is quite simple, but there might be various reasons for this error to occur. In this guide, we will walk you through some troubleshooting steps to fix this error.

Understand the reasons behind this error

1. No Operating system is selected in the BIOS boot menu

Understanding the reasons being this problem is very crucial. 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.

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.

When you remove the external drive, your computer doesn’t find any bootable drive to boot with.

In these types of situations, your computer didn’t find any bootable drive enabled in BIOS settings to load the operating system and throws this error.

2. Inactive OS partition on Hard Drive

Another possible reason is partition where OS is installed in set as inactive. This may happen due to malware attack, power outage, etc.

Fix: “Reboot and select the proper boot device” error

1. Check the Boot option in BIOS settings

The easiest way to solve this “Reboot and select proper Boot Device” error is to check the BIOS boot menu and see if the Boot option is disabled and no hard disk is selected to load the operating system.

Follow the steps below to check the boot menu.

  1. First of all, restart the computer using Ctrl + Shift + Alt keys.
  2. As soon as the computer starts, press the ESC, DEL, F2, F10, F12, or whatever key your PC takes as input to open the BIOS settings. If you’re not sure how to open BIOS settings, you may visit the computer manufacturer website and find the solution.
  3. Go to the Boot tab.
  4. Then, select Boot Device Priority.
  5. Set the primary OS in the First Boot order if not set.
  6. Save and exit.

If your computer is running an old BIOS version, and you don’t find these options, don’t worry.

Press the ESC key when the computer starts to open the startup menu. Go to the Boot Menu or Boot device options, change the boot order, and select the hard drive as the first boot order to boot the computer.

There might still be complications for you to change the boot order; you should contact the computer manufacturer for more help.

If your computer supports Legacy support, you should check in the Boot option whether Legacy support is enabled, and the hard disk is selected in the legacy boot order.

Now your computer should boot the operating system properly.

2. Disable Legacy Boot

If your computer has UEFI instead of BIOS, and if the legacy boot option is enabled, this may cause the “Reboot and select the proper boot device” error.

For more information about UEFI vs BIOS, follow this guide –

  1. Restart the computer using Ctrl + Shift + Alt keys.
  2. Open BIOS settings, then find the Boot menu or Boot options.
  3. Disable the Legacy support.
  4. Save the settings.
  5. Restart the computer.

Now check if your computer does boot the operating system. If still, you get the same error or a different error this time, we recommend you should enable the Legacy support back.

3. Check whether Hard Disk or SSD is working

This challenge could be a little complicated for you to check whether the Hard disk is working properly. If the hard drive has failed, the computer will be unable to boot the operating system.

You can run a hard disk diagnose test through the BIOS settings and check the hard disk condition.

4. Use Diskpart to check the partition

Diskpart is a command-line tool that can be used to mange the disks on the Windows computer.

To use the Diskpart command-line tool, you need to boot your computer in recovery mode to access the command prompt.

Related article: How to Boot Windows in Recovery Mode

Once you’re in recovery mode, follow the below steps.

  1. Select the Troubleshoot option in the recovery mode.
  2. Then Advanced option > command prompt.
  3. This will open the command prompt.
  4. Type the following commands respectively in the command prompt. Hit the enter button after typing each command to execute.
list disk

List disk command will list all the disk that are installed on the computer.

select disk 0

Generally, 0 is the order of the primary disk. You have to select the primary disk where the OS is installed. You should check your disk order number, then hit the command.

list partition

This command will list all the partition of the hard drive.

select partition 1

Enter the order number of the partition where operating system is installed. In my case my primary partition order is 1, in your case, it could be 2 or 3.


Once the partition is active, exit the command prompt and restart the computer.

Now, your computer should boot the operating system.

Now, I hope you will keep away from the “Reboot and select the proper boot device” error. If you still have any errors, feel free to comment below.

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