Booot device not found problem

Hello，Seroshiro

Thank you for posting in the Microsoft community.

I saw that you encountered the prompt "No boot device found" after starting the device, and then closed it immediately.

In your description, there are many places that can provide us with system error information and help us help you locate the cause of the problem. For example, when you encounter a blue screen error, what error message is displayed on the page?

I understand your anxiety very well, so I will help you as soon as possible. Before receiving your reply, based on the situation that you described that you encountered the problem after deleting the hard disk data, I guess that the blue screen you encountered may display the error code 0x7b, which prompts the operating system to be unable to access the system partition during the startup process, and then unable to find the boot device. Please note that we do not rule out the possibility of hard disk failure itself, which requires you to go to an offline computer repair shop for further inspection. Now we provide a solution to repair the system at the system level for troubleshooting. After you have tried to reinstall the system, you can ensure that the error is not caused by the system itself, but if the problem still exists, it means that you may need to perform hardware detection.

You can click on the link provided below to view the detailed steps.

Disclaimer: Let’s try performing an in-place install or in-place upgrade which will refresh your Windows files and operating system without removing files or applications. That being said, we always recommend that if you have important data, you should back it up before making large system changes. If you want to back up your data first, please do so. Once you are done backing up, you can follow the steps in the following guides(This is an English page. You can use translation tools to assist reading): 

• How to perform an In-place Upgrade with Windows 10 Step-by-Step Guide - Microsoft Community

Or you can check out the following simpler instructions:

Please rest assured that the in-place upgrade the system will theoretically not affect your data and applications (you need to choose to keep files and applications in the next steps), just update all the system files are the latest.

If you have important data, you may make additional backups to prevent accidental loss of your data. Also make sure there is enough free space in the system partition, at least 40GB.

1. Download Windows 10 ISO file

 Visit Download Windows 10 (microsoft.com) and click "Download Now" under “Create Windows 10 Installation Media” to download MCT (Media Creation Tool).

Then run the program, select "Create installation media (USB flash drive, DVD or ISO file) for another PC”, and then choose Language, Version, Architecture(if you are not sure about these, choose "Use the recommended options for this PC"), then select "ISO file" in the "Select Media to Use" interface, and then a windows ISO file will be downloaded to your disk (about 4-5GB in size, it is recommended that you choose a non-system disk).

2. In-place upgrade the system

After the download is completed, double-click the ISO file, double-click to run "setup.exe" in the open file explorer, and select "Change how Windows Installer downloads updates" > "Download updates, drivers and optional features", Select "Keep personal files and apps" after accepting the terms of the agreement, then click "Next" > "Install". Then the system will reboot a few times, and then enter the welcome screen.

You can perform the following steps to reinstall the system

You can view the specific steps and required image files for reinstalling the system in the following official link. Please click

Reinstall Windows - Microsoft Support

I am sorry to see that your data files have been deleted by mistake. In order to avoid such losses in the future, you can use cloud storage software or external storage media to back up the required data, so that you can recover the data loss in time. We hope that you can find what you need. If you have any questions, please don't hesitate to share with us at any time.

Thank you for your understanding and cooperation!

Best Regards，

Rota|Microsoft Community Support Specialist

Hi, I'm Robinson, and I’m happy to help you today.

The error "Boot device not found" is usually caused by a hardware issue. The problem could be on the SATA cable, SATA port, or in the hard drive itself.

You can try to replace the SATA cable and switch the SATA port and check if it fixes the problem.

If the problem persists, the problem is probably in the hard drive. You can use a tool called SeaTools bootable to check the health of your hard drive and scan it for errors. You will need to use another computer to download it and create the bootable flash drive.

"SeaTools Bootable is a comprehensive, easy-to-use diagnostic tool that helps you quickly determine what is preventing you from accessing data on your desktop or notebook computer. It includes several tests that will examine the physical media on your Seagate, Maxtor or Samsung disk drive and any non-Seagate disk drive."

You can see more information and download the SeaTools at these links.

https://www.seagate.com/manuals/software/seatoo...

https://www.seagate.com/content/dam/seagate/mig...

If SeaTools identifies any problem with your hard drive, it means that your hard drive is physically damaged and needs to be replaced.

Note: These links are non-Microsoft websites. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.

I hope this information helps. If you have any questions, please let me know and I'll be glad to assist you further.