Reboot and select proper boot device [Error Fixed]

How do I fix reboot and select proper boot device?

1. Enable or disable Legacy Boot (only UEFI computers)

1. Restart the computer and enter UEFI settings. 
2. Search the Legacy Boot option.
3. Enable or disable Legacy Boot.
4. Save changes.
5. Restart computer.
6. Verify if the problem disappeared.

Reboot and select proper boot device message can appear on a new PC, and if that happens, be sure to check the UEFI settings.

2. Verify computer boot order

1. Restart the computer and enter BIOS.
2. Choose the Boot section.
3. Verify the order of boot devices.
4. Set Hard Disk Drive (HDD) as the primary boot source.
5. Press F10 to Save and Exit.
6. Click Yes to confirm changes.

If you ever encounter Reboot and select proper boot device or insert boot media in selected boot device and press a key, usually the problem is your boot order, so be sure to adjust it accordingly.

3. Use Startup Repair and diskpart

1. Insert a Windows installation disk or USB.
2. Launch BIOS and navigate to Boot section.
3. Select CD-Rom Drive as the primary boot source.
4. Press F10 to Save and Exit.
5. Select your preferences for language, time zone and keyboard layout.
6. Click on Next and then Install Now.
7. Select Repair your computer and enter Startup Options.
8. Click on Troubleshoot and then choose Automatic Repair.
9. Choose your Operating System and select the Administrator account.
10. Type in your account password and click on Continue.

This is the first part of the solution called Startup Repair, and at the end, you must restart the computer if you are prompted to.

Once the process has finished, you will be notified if problems were detected and if the Startup Repair has fixed them. The second part of this solution involves activating diskpart.

1. Go to Command Prompt.
2. Type in diskpart
3. In diskpart type in select disk 0
4. Select disk A for the section containing your Windows.
5. Type in list partition
6. Type in select partition 1
7. Type in active
   

After setting your partition to active, the Reboot and select proper boot device message with your SSD should be gone.

Note: You might have to select different partition depending on the number of disks and partitions that you have on your PC.

4.  Replace CMOS battery

1. Open your computer case.
2. Locate the CMOS battery on the motherboard.
3. Remove CMOS battery.
4. Press and hold the Power button for 10 seconds.
5. Insert the CMOS battery again. Alternatively, you can replace your battery with a new one.

Your computer’s motherboard contains a small circular cell that is the CMOS battery. By removing the battery, you’ll reset your settings to the default and hopefully fix the Reboot and select proper boot device error.

5. Reinstall Windows

This is the ultimate solution available for you if the reboot and select proper boot device error will not disappear after trying the previous ones.

We have an in-depth guide on how to reinstall Windows 10, so be sure to check it out.

In most cases Reboot and select proper boot device message appears due to your BIOS settings, but hopefully, you managed to fix this issue using our solutions.