5 Perfect Solutions to Getting Missing Operating System Back

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When you tried to start a Windows operating system, you may receive the error message Missing Operating System on the black screen. That’s a so annoying error since it will prevent you from entering Windows. Well then, what’s the cause for this error and how can we get missing operating system back? These are what we are going to talk in this post.
Both hardware issues and software failures can make an operating system not found, and here we mainly list the following 5:
1.The basic input/output system (BIOS) does not detect the hard disk that installs Windows.
2.The hard disk failed either physically or logically.
3.Users make inappropriate or incorrect BIOS settings.
4.Windows Master Boot Record (MBR) located on the hard drive is damaged or corrupted.
5.The partition which saves Windows boot files is no longer active or users set wrong partition active.

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Created by luoluo 5 years 1 week ago – Made popular 51 years 24 weeks ago
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While trying to boot your computer, perhaps you can find the PC is unbootable, and an error message like “Missing operating system” or “Operating System not found” appears on your computer screen.

When suffering from this problem, you are not allowed to access Windows 10/8/7. Then, you want to know the causes for this issue and the solutions to it. To be specific, there are five factors, for example, Windows Master Boot Record (MBR) is damaged, the system partition holding boot files is not active, BIOS settings are not correct, the hard drive is damaged, BIOS doesn’t detect the installation disc. Depending on different reasons, the solutions are also different. So, just figure out which situation your computer faces and try the relative way.

How to Restore Deleted Windows Partition after Windows Can't Boot? 4 years 1 week ago

For a system disk with GUID Partition Table, there is an EFI system partition (ESP) which refers to a partition used by computers adhering to the Unified Extensible Firmware Interface (UEFI). When your computer is booted, UEFI firmware loads the files on this ESP partition to start the installed operating system and various utilities. Usually, EFI system partition is formatted with FAT file system. From the definition of ESP partition, you know once EFI system partition is lost, Windows will be unbootable because of the missing boot files.
When installing an operating system such as Windows 10/8/7 to a clean formatted MBR disk, the system reserved partition will be created at the beginning of your hard disk with the active status. This partition contains three important things including the Boot Manager and Boot Configuration Data, and the startup files used for BitLocker drive encryption.

Once you accidentally delete system reserved partition, Windows will fail to boot due to missing BOOTMGR and BCD. And it is possible that BOOTMGR is missing or operating system not found error message appears.

So, what should you do to recover deleted Windows system partition? Look at the following content to know the methods for lost system partition recovery in two cases.

How to Repair MBR (Master Boot Record) in Windows 10 - MiniTool 3 years 31 weeks ago

Have you heard of MBR? It can also be called Master Boot Record which will be created at the beginning of your hard drive. And it contains the partition table of your hard disk as well as operating system bootloader. Once MBR gets corrupted, your Windows 10 computer won’t start up.

Simply speaking, malware infection, improper shutdown or mistaken operations can lead to MBR corruption. Once Windows 10 fails to boot due to the damaged MBR, an error like “BOOTMGR is missing”, “invalid partition table” or “operating system not found” will show up. In these cases, one of the effective troubleshooting methods is to fix Windows 10 MBR. How can you do Windows 10 repair boot? More on this later.

Quick Repair Corrupted MBR with MiniTool Partition Wizard 4 years 31 weeks ago

As you know, MBR is the master boot record on the hard drive in your computer. It is always created in your first partition, and it is very important for your hard drive. MBR contains the executable codes for the computer boot, which always locates in the first sector of your disk. If your disk MBR gets corrupted, the operating system will fail to boot.

Usually, when system is unable to boot, you can get some error messages or information, such as “A Disk Read Error Occurred”, “Operating System not found” or “missing operating system”. In these cases, you should consider that the master boot record is damaged. Why does MBR get corrupted? Generally speaking, there are some reasons, including virus infection, mistaken operation or sudden power failure.

Here Are 6 Ways to Fix Invalid System Disk Error in Windows 10/8/7 3 years 20 weeks ago

Have you ever encountered this "Invalid system disk. Replace the disk, and press any key" error message when you boot into Windows? Is it possible to fix invalid system disk error in Windows 10/8/7 without losing data?
Solution 1. Set the Bootable Disk as the First Boot Disk
As we know, if you set an unavailable disk as the first boot disk, you will receive the invalid system disk error message. Now, you can set the bootable disk as the first boot disk to fix invalid disk system error in Windows 10/8/7.

You can unplug any USB flash drive, external hard drive, CD or floppy disk if you want to boot from the internal hard disk. However, if you want to boot from a removable disk, you have to make sure it is bootable and set it as the first boot disk. Now, you can try the following steps to change the boot order.
Step 1. Start the computer and go to BIOS setup.
Step 2. Use the arrow keys to select the BOOT tab.
Step 3. Move the boot disk to the first position in the list.
Step 4. Save the Boot order changes and exit BIOS.
Step 5. Start the computer with the new boot order.

Solution 2. Check and Repair Disk Errors
If you still receive the invalid system disk error in Windows 10 after changing the boot order, you can check and repair disk errors because disk corruptions also result in this error. However, how?

MiniTool Partition Wizard is recommended here. With this powerful tool, you can easily and quickly complete this task without any difficulty.
Solution 3. Repair Master Boot Record
MBR, Master Boot Record, is a boot sector at the very beginning of computers' hard drive and records the information of all partitions. Corrupted MBR is a common reason for the appearance of invalid system disk error. Now, try using MiniTool Partition Wizard to rebuild MBR to exclude this factor.
Solution 4. Perform an Automatic Repair

Best Solutions to Fixing Missing Operating System in Windows 10/8/7 3 years 18 weeks ago

When power on your PC, sometimes you receive a black screen with an error message that reads “Missing operating system”. How does this happen? How can you remove this error and boot Windows normally? Just find the answers in this post.

Tip: sometimes this error message is shown as “Operating system not found”, both of them means the same thing and has the same solutions.

If You Get Windows Error Recovery Screen in Windows 7, Fix It! 1 year 14 weeks ago

Although Microsoft has ended the support of Windows 7 since January 14, 2020, there are still many users running Windows 7 on their PCs since its ease of use and reliability.

But, Windows boot problems always occur no matter which operating system you are using (Windows 7, 8, or 10). During the startup of the Windows operating system, a blue screen or black screen appears along with an error message. Today, we will discuss a Windows 7 black screen error - Windows error recovery.

When booting up Windows 7, the Windows error recovery screen comes out of the blue and you see an error message “Windows failed to start. A recent hardware or software change might be the cause”, as shown below. Sometimes, you get another interface of Windows error recovery with different options.