Reboot and Select proper Boot device

This is a BIOS error message. It basically occurs when the computer system’s BIOS is facing some difficulty in finding the system drive or some other bootable device. It doesn’t matter what PC device you’re using or what operating system/version your PC has got, as this error can occur anywhere.

The error message conveys to you that the BIOS is unable to recognize your PC’s operating system drive. It is telling you to connect the drive to your PC if you haven’t already. And if you don’t connect the device, the POST display screen will always show the error message.

Most of the time the Reboot and select proper boot device error occurs when the OS Drive is removed or disconnected from the computer’s mainboard. Even if the system’s drive isn’t touched, the error can occur. That may be possible as the hard disks or SSDs lose their connection automatically and stop responding. The PC’s BIOS can also automatically reset and forget the boot selection setting which can also cause the error. Moreover, if the operating system is corrupted or the boot volume of the operating system is corrupted, the error can originate.

Though, this error can be fixed if you follow this Troubleshooting Guide.

Remove All Connected External Devices

First of all, you have to remove every external device/peripheral connected to the PC. When the PC starts, every connected storage device is scanned, and if anything is found bootable, the PC changes the boot sequence automatically. This causes the error message to appear on your screen.

Troubleshoot System’s Drive

The problem is completely related to your system’s drive. This is why troubleshooting your PC’s OS Drive can help in solving the error. So check if the hard disk drive or solid state drive is connected to the PC properly. You can do that by going to BIOS and checking the status of the bootable connected devices.

To do that, follow these steps:

  1. Open the BIOS Menu by pressing Del key or F2 key again and again after you turn the PC on. If it was powered on for a while, then turn it off and start it again, as you can only open BIOS when the first black screen appears (during startup).

However, it is possible that these keys might not work. So check the predefined key for the BIOS menu on your PC’s start screen.Predefined key for the BIOS menu

  1. When BIOS opens up, go to the Boot Setting or Standard Cmos Features or something that can show you the connected bootable devices.Boot Settings
  2. Check the status.

If the hard disk or SSD isn’t listed in BIOS, then you can know that the drive isn’t connected properly. Maybe it’s dead, or there is some fault with the cable. Try changing the storage drive’s power connector with another free connector from the PSU (Power Supply). Or just open the computer casing and replace the old existent SATA cable with a new one or disconnect the SATA cable from the currently-attached-to slot and insert it in another free SATA slot. Also, try using another HDD/SSD in your device to check if the current one is dead or not.

Connecting SATA cable

If the hard disk or SSD is listed in the BIOS, then you know that the drive is connected properly. Maybe there other possible reasons behind the problem like changes in the BIOS Boot Setting, problems in Windows startup process, inactivity of the Windows drive or corruption of the Windows Master Boot Recode.

You have to find out what reason is behind the error and then proceed with the steps listed down below to fix the Reboot and select proper boot device error.

Step 1: Fix Boot Setting

The BIOS Boot Setting configuration allows your PC’s BIOS to boot every bootable device in a sequence. You can fix the problem by changing the Boot Order/Boot Sequence for your system’s primary storage drive (HDD or SSD).

To do that, follow these steps:

  1. Open BIOS Setup.
  2. Open Boot Setting.
  3. Set Hard Disk or SSD as the first Boot Device Priority.Boot Priority Order
  4. Save.
  5. Restart your PC.

If the first Boot Device Priority is already set to HDD or SSD, proceed to step 2.

Step 2: Fix Windows Startup Problem

This error can occur and stop the entire booting process if your Windows operating system is having some problem in starting up. In this case, all you need to do is perform a startup repair using the Windows operating system installer disc/USB/what you used to install your operating system.

If you don’t have the same disc or USB, then use any Windows setup disc or USB. Just make sure that the operating system version is the same as the one you’re using.

To do that, follow these steps:

  1. Use Boot Menu or Boot Sequence Priority to boot your disc or USB.
  2. When you see the Press any key to boot from CD or DVD/USB message, press any key.Press any key to boot from the CD.
  3. Go to Startup Repair or Automatic Repair.
  4. Follow the on-screen instructions and click on Next.
  5. Click on Startup Repair.

Step 3: Fix Windows Inactive Drive

The bootable partition contains your PC’s operating system. Only one partition can be active at a time during Windows installation. Sometimes virus corruption or something makes that partition inactive. You have to reactive that partition then.

To do that, follow these steps:

  1. Open Command Prompt.
  2. Enter the following commands one by one and press enter after typing each:

diskpart

list disk

select disk 0

list partitionCommand Prompt

select partition 2

activeCommand Prompt 2

exit

  1. Restart your PC.

Step 4: Fix Windows Master Boot Recode

The Master Boot Recode (MBR) is the most important bootable data source in the OS Drive, which is entirely responsible for compiling files to start the Windows operating system. The MBR is created during Windows installation and requires repairing when it gets corrupted. A corrupted MBR can also cause the error, so you have to repair it.

To do that, follow these steps:

  1. Open Command Prompt.
  2. Enter the following commands one by one and press enter after typing each:

diskpart

list volume

exitCommand Prompt 3

Find your Windows drive letter in the list and use that drive letter in the next command.

D: (put your Windows drive letter)

bootrec /fixmbr

bootrec /fixboot

chkdsk /f /r

Y

  1. Restart your PC.