HOW TO FIX THE PROBLEM OF AN OPERATING SYSTEM WASN'T FOUND IN WINDOWS 10 PC

THE AUTHOR OF THIS BLOG IS YONA MESHACK SHANNY

PUBLICATION DATE: JUNE 18, 2023

NAME OF PROJECT: YOMESHA THIRD PROJECT

TITLE OF PROJECT: HOW TO FIX AN OPERATING SYSTEM NOT FOUND

E-MAIL: shannyyona@gmail.com

WhatsApp PHONE NO: 0685046743

NAME OF BLOG: tztech-media.blogspot.com

MAIN PURPOSE OF THE AUTHOR:

TO EDUCATION THE COMMUNITY ALL ABOUT THE WORLD OF SCIENCE AND TECHNOLOGY
WHAT ARE BENEFITS AND MISCHIEF OF THE WORD OF SCIENCE AND TECHNOLOGY
HOW TO OVERCOME DIFFERENT PROBLEMS CAUSED BY THE WORLD OF SCIENCE AND TECHNOLOGY

INTRODUCTION

An operating system is the system software that manages computer hardware and software resources, and provides common services for computer programs.

An operating system was not found in windows 10? How to fix it when this error occurs after a windows upgrade, a BIOS upgrade, or after cloning your hard drive to another disk?. In the following content, you can find out a proper solution to this error.

Recent days, I was upgraded my PC from windows 10 to windows 11. The upgrade was quite successful however, after that, I couldn't boot my PC. It showed " An operating system wasn't found. Try disconnecting any drives that don't contain an operating system. Press Ctrl + Alt + Del to restart".

The error " An operating system was not found" in windows 10

The following error " An operating system wasn't found". Try disconnecting any drives that don't contain an operating system. Press Ctrl + Alt + Del to restart". could appear in windows 10 during operating system (OS) startup. This error can be displayed after upgraded windows, for instance from windows 10 to windows 11, updating BIOS or cloning a hard drive to another. No matter was triggers this error, here you will find some useful methods to fix the " OS not found in windows 10" issue.

Below are some common factors that might be the cause of an operating system not found in windows 10 pc

When the BIOS fails to detect the drive that helps to install windows
Hard drive failure
MBR corruption
Corruption of partition that holds windows booting files

We could be done to fix operating system not found error in windows 10?

It tells you to restart the computer by holding Ctrl + Alt + Del button, to solve the issue. Sometimes, you can get your Windows 10 to a normal state by pressing these buttons whereas in some situation it won’t work. Hence, I have listed out some easy techniques which may help you to get rid of OS not found error in Windows 10.

Fix #1: Modify BIOS Settings

Restart your computer and hold down F12 (It will vary depending on the model and OS) to enter BIOS configuration. And, change internal hard drive as first boot device. It will fix OS not found error. If it doesn’t resolve, then try out the next method.

Fix #2: Windows Startup Repair

Use Windows Boot Media to boot into Windows 10
When startup screen appears, select appropriate Language, Time, Currency, and keyboard input method and then press Next.

3.In the next screen, hit Repair your computer button
4.Next, go to Troubleshoot > Advanced options > Startup Repair

5.Wait for Windows diagnosing process to complete

It will take some time to complete the process. Don’t do anything while the process is being carried out. Once after completion, you will be able to boot into Windows without any error. It resolves OS not found error.

Fix #: Repair Boot Files

Boot into Windows 10 using Windows Boot media
Set Language, Time – Currency and keyboard input method in the setup screen and press Next
Hold down SHIFT + F10 keys to open the command prompt in the next screen
Once you open command prompt, next step is to find whether your drive is set to GPT or MBR for that type disk part and hit enter
Then type list disk and press Enter

6.Locate your disk and then go to GPT column. If it has *, then it indicates that the disk is GPT. If is

not * the disk is MBR.

7.Exit from the disk part

In case, disk is set to MBR, follow the steps mentioned below to repair boot files-

Type dir. a: in command prompt and hit Enter.
When it shows directory list, look for the \Windows folder in the directory.
If you are unable to locate \Windows folder, then type dir. b: and hit Enter button. And, type dir. with every alphabet until you find a drive with the \Windows folder. But, don’t use alphabet X drive as it has installation files
After finding the drive containing \Windows folder, type: bcdboot drive name:\Windows /S drive name: [where drive name is drive letter of the disk in which you have found \Windows folder]
When you see “Boot files successfully created” message, you can continue with the next steps
Again type disk part followed by list disk command in the command prompt
Next, type select disk drive name and press Enter [ replace drive name with the drive where Windows folder was found]
Then, type list volume and hit Enter. Again, type select volume drive name and press Enter [where drive name is the drive where Windows folder was found]
Next, type active and hit Enter button
You will be get notified once the volume is successfully set to active.

If disk is set to GPT, then do as follows-

Type dir. a: and press Enter, in case a is the drive where your \Windows folder is present. If not and you don’t know the drive where your \Windows folder is present, then type dir. with every alphabet.
Next, type disk part command followed by list disk and press Enter
Then, type select disk drive name and press Enter (replace drive name with the drive letter of disk containing Windows folder)
Next type list part command and hit Enter.
Now, find the partition that is labeled as System
Once you find the system partition, name it as R. In case, R is already assigned to some other partition, then use any other alphabets. Type assign letter=r: to assign name to system partition.
Then, exit and again open command prompt to enter the following command. After each command line hit Enter button.

cd /d r:\EFI\Microsoft\Boot\

ren BCD BCD.bak

bcdboot c:\Windows /l en-us /s m: /f UEFI

Now, exit the command prompt and detach Windows 10 Boot Media. Then, turn on your Windows 10. If you are still getting an error, then reinstall your Windows 10. In case, you end up losing data due to reinstallation, then use data recovery tools and recover lost data from partition of your Windows 10 drive.