How to solve No Boot device found in computer

No boot device found

When you turn your computer and you get the error No Boot Device found, it might be confusing. You probably had been turning your computer on and off for a long time without problems. In this article you will learn how to fix, No Boot Device found error. This is caused by a number of different issues so we will start with basic and then the advanced.

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Removable devices causing no boot device found

The most frequent cause of the Boot device not found error are connected external devices for example a flash drive, cd/dvd disk or external Harddisk. To fix the issue remove any flash drives and external harddisk that are connected also eject a disc from the CD ROMs.
Press enter or CTR + ALT + Delete to continue to reboot. Your computer should be able boot from the C drive with your operating system, be it windows 10 or windows 8.

Fix No boot device found using Boot order

The error also happens when windows finds the device that is the first one in the boot order not containing any operating system files. For instance, let’s say the computer is set boot from the CD. When you turn on windows, BIOS search for a disc containing your operating system on the CD rom.
If there is no disc, the disc that’s in the cd rom doesn’t have the windows operating system its improperly configured then you get the error. You will be prompted to press any key to continue then your computer will restart again.

To fix this, when the computer is turning on, press F12 if it’s a dell laptop to go Boot options. Then select the Harddisk which contains the operating system. Alternatively, to permanently fix the issue. Interrupt the boot process on the Dell logo splash using the F2 key on the dell computer. You will enter the BIOS menu, navigate with the arrow keys on your keyboard to Boot order. Now rearrange the boot order using the directed keys either + – keys or arrow keys. Press F10 to save the settings. Now boot the computer.

USB Flash drive No Boot device found

If you are trying to boot from your flash drive and you getting the above error, operating system not found on this device or any other related problems. That means your USB drive is not bootable or it is not correctly configured. You will need to properly create a properly bootable flash drive.

Merely copy windows files to a flash drive will not make it bootable. I have had people ask why it’s not working when they had just copied the windows operating system files to their device.

There are multiple ways of creating a bootable device. You can use third party tools like Rufus or use command prompt or PowerShell

How to create bootable flash drive

Create a bootable USB using Rufus

Rufus can create bootable USB flash drive with windows 7, windows 8 and even windows 10. You will need to have a functionally ISO image of the operating system. You can download operating system from windows website or your computer manufacturers website

Go and download Rufus

Rufs menu with no flash drive detected
Rufs menu with no flash drive detected
  1. Insert the USB flash drive that you want to use a boot device
  2. Double click the exe file
  3. Click on the disk like icon and browse to your
  4. Select the iso image containing the operating
  5. Then click start
  6. Just make sure Rufus detected the correct flash drive before clicking start. All data that is in the flash driver will be irrecoverable destroyed.
    You will have to wait for a couple of minutes depending on the speed of your computer and flash drive.
    After its done you can insert the flash drive into the computer and boot from the flash drive

Create bootable flash using command prompt

With windows diskpart you can create a bootable USB flash drive

Creating bootable flash drive from command line
Creating bootable flash drive from command line
  1. Start Command Prompt as administrator.
  2. Type “diskpart” command.
  3. Type list disk, and then click ENTER. The will list all the disks on the computer.
  4. Note the drive number or drive letter of the USB flash drive. For example, in the screen shot below there is no flash drive but my harddisk which is Disk 0. If you have other drives there will be listed here.
  5. At the command prompt, type select disk <Z>, Z is the either the drive number or drive letter of the USB flash drive, and then click ENTER.
  6. Type clean, and the click ENTER. This command deletes all data from the USB flash drive.
  7. Now create a new primary partition on the USB flash drive, to create the partition type create part pri, and then click ENTER.
  8. To select the partition that you just created, type select part 1.
  9. type format fs=ntfs quick, and then click ENTER. This will format the drive.
  10. To format the partition as FAT32, type format fs=fat32 quick, then press ENTER or return key.
  11. Type active, and then click ENTER.
  12. Type exit, and then click ENTER.

Now you can copy the contents of you windows file to the root of the flash drive
Then you can boot from the flash drive

Harddisk problems causing no boot device found error

If the harddisk is malfunction you can also get this error. Also if the Operating system containing the harddisk is corrupt you will get the error message. To fix you will have to reinstall the operating system.

You can also check if the harddisk is being detected in the BIOS. If its not being detected switch of the machine and trying reconnecting the cables on the harddrive.

Another option would be to run the Dell hardware diagnostic tool. This will check all your hardware for issues.


  1. You seem to be very knowledgeable and the I’d like to ask for your help.
    Dell T3500 two HDDs the second used for storage only.
    All of a sudden this secondary drive wouldn’t show up, I was editing a large video file at the time.
    Restarted thinking it was due to the load on the machine. No luck.
    Shut down, switched on, nothing again.
    I thought I’ll do a System Restore to see what’s happening.
    That was it, the Windows drive gone as well, Boot Device not found message plus warning sound ever since.
    I took both drives off the PC put them in a USB caddy in my spare PC, OK all files there no problem viewing, opening editing just fine.
    Put back in PC nothing showing.
    Put a blank HDD in no warning sound and no Boot Device not found message.
    Am I right to assume that some drivers are corrupt? Any idea how to repair?
    Many thanks for reading this.

  2. Hie, from reading the details in your question my best bet is your hard drives and your Motherboard have decided to have a divorce.

    Lets try resetting your bios to see what that does. The instructions are on this article
    After the reset, put your drives back in and see if they get detected or not.

    Failure to that, you may have to try a hardware fix which I wouldn’t recommend you do on your own.

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