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How to Quick Fix Boot Device Not Found Issue in Windows 10/8/7

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"I got my PC in 2010, it was working fine until tonight when I turned it on it said boot device not found and to please install an operating system on my hard disk- (3F0). I used it this morning before I went to work and it seemed fine. I don't have an operating system disk for my hard drive. What can I do?" --tomsguide


Boot Device Is Not Found/Available


Nowadays with the development of technology, more and more persons use computers to deal with some things in work and life. As for you, you are also the one to write papers, make forms, develop new applications .etc by using a computer. However, as time goes by, some computer issues happen to you, for example, system breakdown, black or blue screen, system file damage, unbootable OS and so on. When one issue appears, it usually follows a specific error message. Among these problems, "boot device not detected" error is very common, which always occurs during the process of booting the operating system, just like the above example shows. This issue appears with some messages, such as "No bootable device – insert boot disk and press any key", "Boot Device Not Found. Please install an operating system on your hard disk…", "No Boot Device Found. Press any key to reboot the machine" or "no boot device is available". Please look at the following pictures to know much information about this issue.

boot device not found

no boot device found

All the above messages indicate one point that system bootable disk is not be detected. So once such an issue appears at startup, your computer is unable to boot, which will bring much convenience to your work and life. If you get one of the messages, what should you do to fix it? Now, this post will offer you detailed causes and solutions to this problem in Windows 10/8/7.

Why Boot Device Not Found


Just like the above content I mentioned, your computer says no boot device is detected or found, that means the operating system can't find the bootable hard disk or the boot sector of the hard drive. In such cases, the important thing is to figure out why your computer fails to boot up with error messages. Is there any clue? Of course. When bootable device not found issue happens to you in Windows 10/8/7, it is most likely that you choose to search solutions online. There are some forums and articles about this topic, and here I summarize some major causes as follows to take as reference:

step Boot PC from an unbootable disk or device
If you meet no boot device detected issue, it is possible you set to boot from an unbootable CD/DVD, a hard drive or a flash drive by mistake.

step The bootable disk is corrupted or died somehow
In addition, another factor should be that your bootable disk gets damaged or died due to some reasons. In this case, the PC OS can't find boot device to reboot your computer normally.

step MBR or boot sector is damaged on the bootable hard drive
Actually, "no boot device found" related problems also probably could be caused by damaged hard disk master boot record (MBR).

step Viruses attack the PC
Perhaps some viruses exist in your PC internal hard disk and some damages to MBR, computer OS files or folders happen, which may cause no bootable device problem.

After learning so much information about the factors to this issue, now it is time to introduce the solutions to you in Windows 10/8/7. Please continue reading the following content.

How to Fix Boot Device Not Found Issue


Have you found the specific solutions to the error? Do you know how to fix it successfully so that your PC work can run as normally as before? Generally speaking, there are five methods to repair this problem according to different factors, so please try them according to your actual situation in Windows 10/8/7.

solution 1 Solution 1: Test And Fix Hard Disk


Firstly you need to check whether your hard disk has a good state or not. Usually, the related bootable device not found issues are caused by the damaged or faulty hard disk. Therefore, it is suggested to test your hard drive. How to do this work? Don't worry, here a reliable and excellent third-party tool – MiniTool Partition Wizard is worth recommending to you. As partition and disk management software, it is designed to manage disks and partitions well, including resizing partition, doing conversion between NTFS and FAT32, doing conversion between GPT and MBR, migrating OS to SSD, rebuilding MBR, copying disk/partition and so on. This tool has "Bootable Media" feature which enables you to manage your disks and partitions when there is no operating system or system fails to boot.

Before you do:

In order to do disk surface test, you need to buy MiniTool Partition Wizard Professional Edition because Free Edition doesn't support to create a bootable disc with "Bootable Media".


recommend Useful articles:
1. How to Build Boot CD/DVD Discs and Boot Flash Drive with Bootable Media Builder?
2. How to Boot from Burned MiniTool Bootable CD/DVD Discs or USB Flash Drive?

Step 1: After building a bootable disc and booting your computer from the device, you will go to an interface. Click "Partition Wizard" to launch this tool.

boot pe loader

Step 2: Then you will go to the main interface of MiniTool Partition Wizard. Select the target disk, and then click this feature "Surface Test" in the left pane.

surface test

Step 3: Then click "Start Now" button to start a disk test. During the process, MiniTool Partition Wizard will mark bad sector "red", and mark disk block without error "green".

test bad sector

step Shield Bad Sectors

If your hard disk has some bad blocks, the important thing is that you need to shield them. Unfortunately, Partition Wizard doesn't have such a feature. But Windows built-in diagnostic tool CHKDSK can be used to shield bad blocks. For more information, click this post 3 Ways to Repair Bad Sectors. Then you may solve no boot device available issue.

step Copy Disk/Partition for Data Backup

After a disk test, if there are many bad sectors, in order to ensure your data security, you had better backup the important files on the target hard disk. Here MiniTool Partition Wizard Professional Edition is also useful to do this work after performing CHKDSK operation.

You can use its two features for the backup:
Copy Disk: it enables to clone the entire disk data to a new hard drive which should be larger than the used disk space of the source disk. This feature adopts sector-by-sector mode during the disk copy.
Copy Partition: if your important files are saved to a partition, this function is recommended.

copy

Please choose one to make a backup according to the real situation.

Here is a detailed video about how to copy disk:



solution 2 Solution 2: Repair MBR or Boot Sector


As you know, if MBR or boot sector is damaged, your PC will fail to boot with bootable device not found issue. As you know, MBR is a part of computer boot hard disk which contains executable code to function as a loader for the operating system and it can help PC boot successfully. Once it is damaged, the error occurs. Therefore, the important thing is to repair master boot record or boot sector. In this case, MiniTool Partition Wizard Bootable Media also can offer a help.

Step 1: Please boot PC from the bootable disc you have built. Then in the main interface of MiniTool Partition Wizard, select the target hard disk to click "Rebuild MBR" from "Check Disk" menu.

rebuild mbr

Step 2: At last, click "Apply" button to finish fixing boot sector and MBR.

Recommended:
In addition to this way, you also can use Command Prompt tool. Please prepare a Windows installation and launch this tool by a specific way in Windows 10/8/7. Then type "bootrec /fixmbr" and "bootrec /fixboot" in turn. This post Windows 8 MBR fix may be useful for you.


tip If you are interested in MiniTool Partition Wizard Bootable Edition, please purchase it's Professional Edition "Bootable Media" feature to make a bootable disc to boot your computer and then fix no boot device found issue.



solution 3 Solution 3: Check and Modify Your PC Boot Order


Just like the first reason shows, you may forget to change the boot order after replacing a hard drive or migrating OS to SSD, so the incorrect hard drive is set as the first device item. In order to remove bootable device not found issue successfully, it is necessary to check whether your boot order is right or not and then modify it to boot system from the correct device in Windows 10/8/7.

1. Restart your computer, and then type a specific key to enter the BIOS.

Note: The way to go to PC BIOS is different for different computers in different Windows operating system. So please press a key according to the real situations, and you can refer to this post How To Enter The BIOS On Your Computer for help.


2. Then under "BIOS Setup Utility" main interface, click "Boot". Then you can check whether the boot order is correct or not. If the computer isn't set to boot from the correct hard disk, please modify the bootable disk as the first boot device by pressing "↑↓" keys.

bios order

3. Then press "F10" to save this change.

When rebooting this computer, it will run well. Like that, the issue "boot device is not found" will be solved. If this way is not useful, please try the next solution.

solution 4 Solution 4: Fix Operating System


In addition, your operating system files or folders may be deleted, lost or damaged accidentally, then no boot device detected issue happens to you. So in order to fix this error, just do as the following guidance:

1. Prepare a Windows installation disc, CD/DVD or USB flash drive and connect it to your PC.
2. Then during the process of installation, Then during the process of installation, fix your operating system.

In Windows 7, under "System Recovery Options" tab, click "Startup Repair".

fix system file

In Windows 8 and Windows 10, click "Repair your computer", then select Troubleshoot > Advanced options >Automatic Repair(Windows 8) or Startup Repair (Windows 10).

advanced options

This way can help fix some problems that prevent Windows from loading or starting.

"Now we have introduced you four ways to fix boot device not found issue in Windows 10/8/7. If you have tried them and make your computer boot successfully, share them with your friends now."

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Suggestion: Make a System Backup


After fixing boot device not available problem, the operating system is in the healthy state now. You'd better make an OS migration for backup. In order to ensure the system runs normally, when system unbootable issue occurs again, OS backup is necessary to recover OS to the previous point.

attention Attention:

1. System backup is only useful to recover the system to solve bootable device not found issue which is caused by system file damage and MBR corruption. If this issue is due to disk bad sectors, it is useless.
2. Here MiniTool Partition Wizard Free Edition is useful to migrate OS to SSD/HD when the system runs successfully.


Bottom Line


Now it is the end of this post. I introduce you boot device not found issue, the factors, the solutions to this issue and also give a suggestion. With the help of MiniTool Partition Wizard Professional Edition, you can easily do disk surface test, copy disk, rebuild MBR and migrate OS to fix such a problem. By trying so many solutions, I believe you can fix boot device not found related issues. When booting the PC again, this error won't happen. Hope this article can help you. If there is any suggestion, welcome to leave a comment below or email us via support@minitool.com. Thanks in advance.