Error: operating system not found or missing operating system


This article shows you how lớn fix error “operating system not found” on Sony Vaio, & provides ways lớn fix the error for all major máy vi tính brands such as HP, Samsung, Toshiba, etc.

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/ Last Updated March 17, 2022

Error: Operating system not found on Sony Vaio

“I have an older Sony Vaio Laptop, model VGN-NR280E, that was loaded with the Vista operating system. I used it well,but recently, it shows an error when booting: operating system not found. What’s wrong with it? How can I fix it? Any help would be thanks.”


How lớn fix error “operating system not found” on Sony Vaio?

To fix the error “”operating system not found” on Sony Vaio, you can bởi as the following steps:

1. Shut down laptop by holding the power nguồn button on the keyboard.2. Start máy vi tính by holding the Assist button on the keyboard. The laptop will automatically go khổng lồ “VAIO Care” mode of Sony Vaio.3. Choose “Start BIOS setup”, or you can press F2.4. Choose the tab “BOOT” on the Menu.5. Here you need khổng lồ get into “Boot Configuration”->”Boot Mode”, and you can see the current is UEFI.6. Press “Enter” & choose “Legacy” to lớn change the value.7. In Extend Device Boot, change the value from “Disabled” to “Enabled”.8. Save all that have changed by select the tab “Exit” on Menu, choose “Save Changes” -> Enter -> Yes.9. After saved all changes, you can exit “VAIO Care” mode by choosing “Exit Setup”,Press “Enter” -> Yes.

As so far, we have repaired “operating system not found” on Sony Vaio successfully. If not, you can refer lớn more solutions shown in the following content.

Why “operating system not found” happened?

When you boot your Sony Vaio or other brands PC, the BIOS tries to find an operating system on a hard drive to boot from. However, if it is unable to lớn find one, then, it will show you the error message “Operating System not found” or the error message “Missing operating system”. This error may be caused by the following reasons:

1. An error in BIOS configuration.

2. A faulty hard drive.

3. A damaged Master Boot Record.

Fix operating system not found for all major máy vi tính brands

Here we provide you three common ways to lớn fix operating system not found in Windows 10/8/7.

Fix 1: Change or reset the BIOS configuration

Fix 2: kiểm tra hard drive is working or not

Fix 3: Rebuild MBR

Fix 1: Change or reset the BIOS configuration

Since boot device not found or operating system is missing occurs when BIOS is unable to find the boot device, checking BIOS settings might be a good solution. To check the BIOS settings, follow these steps:

1. Restart the computer.

2. Press the key to mở cửa BIOS menu. The key depends on the computer manufacturer and computer model. It can be any of the following: Esc, Del, F2,F8, F10, or F12.

3. When you get into the BIOS’ main screen, you need to check whether it detects the hard drive, và whether the boot order is right.

4. If the hard drive is not detected properly, you should reset the BIOS settings to default values.

1>. Enter BIOS.

2>. Find the Reset to mặc định or cài đặt default option - it could be a hot key, or an option in the menu.

3>. Choose the reset option, & answer “Yes” when prompted for confirmation.

4>. Then, select the “Exit -> Exit saving changes” option.

Fix 2: check hard drive is working or not

The “operating system not found” in Sony Vaio or other brands lượt thích HP, Asus, Dell, Samsung, etc, may because of faulty hard drive. Thus, you need to kiểm tra whether the hard disk is working or not in BIOS.

1. Plug the AC Adapter into the computer if it is not already connected.

2. Turn off the computer và wait 5 seconds.

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3. Press the power nguồn button khổng lồ start the computer & repeatedly press the special key to enter the BIOS thiết đặt menu.

4. Use the Arrow Keys lớn choose Diagnostics or Tools to check hard drive is working or not.

You can also use third-party software to check whether there are bad sectors on the hard drive. Like AOMEI Partition Assistant Standard, which allows you to bởi that.

1. Connect the hard drive to lớn a valid Windows PC which installed AOMEI Partition Assistant (you can tải về AOMEI Partition Assistant Standard không tính tiền from its official website).

2. Launch AOMEI Partition Assistant. Right click the hard disk you want to check. Select Surface Test.


3. Click Start to kiểm tra the hard disk.


If there is nothing wrong with the hard drive, you can find other solutions for “operating system is not found” on Sony Vaio or other computer. If there is bad sectors, you can try khổng lồ fix it or replace the disk with good one.

Fix 3: Rebuild MBR

If the “operating system not found” error is caused by a damaged master boot record, then you need lớn fix the MBR error.

1. Start your computer with a Windows 11/10/8/7 installation CD/DVD.

2. Click Repair Computer -> Recovery Option-> Command Prompt.

3. Type the following commands khổng lồ fix MBR:

Bootrec.exe /scanos

Bootrec.exe /FixMbr

Bootrec.exe /FixBoot

Bootrec.exe /rebuidbcd

If you vị not have the Windows 11/10/8/7 installation disc, you can use AOMEI Partition Assistant to lớn create a bootable disc và rebuild MBR by AOMEI Partition Assistant.

Step 1. Use AOMEI Partition Assistant lớn create a bootable truyền thông media (USB, CD/DVD) on another normal PC.

Step 2. Insert the bootable device you created before to lớn the computer which displayed “Operating system not found” error, & boot the computer from the bootable media.

Step 3. It will display the main interface of AOMEI Partition Assistant after booting. Right click the disk, select Rebuild MBR.


Step 4. Set the type of MBR for the current OS. ClickOK.


Step 5. Confirm the operating and clickApply.>Proceed.


Finally, remove the bootable device, và restart your computer from the hard drive normally.

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As so far, you have learned the ways for how khổng lồ solve “Operating system not found” on Sony Vaio or other brands. AOMEI Partition Assistant is more than a tool that helps you to demo disk, or rebuild MBR. It is also a partition manager that can help you create partition, format partition, resize partition, etc. You can upgrade lớn its professional edition to lớn unlock more functions, such as cloning GPT system disk, converting dynamic disk into basic without losing data. Well, if you are Windows server users, you can use AOMEI Partition Assistant server to solve those problems easily.