Windows Failed To Start: Quick Tips to Help You Find the Best

Windows Failed To Start: When I tried to start my computer, suddenly I got a black screen and the words “Operating System Not Found”! Even if I wait for a while, I can’t start because I can’t move on. I have to work right away … I have important documents saved … What is the state of your computer at such times? What should I do?

Windows Failed To Start

What does the error message mean?

This error message is displayed when the location where the Windows system files are stored cannot be found. The error message differs depending on the computer model, and even if the following message is displayed, it indicates that the storage location of the system file cannot be found.

  • Missing Operating System OS not found
  • DISK BOOT FAILURE Failed to boot the disk
  • Invalid system disk – Non-system disk or disk error
  • There is no system disk or there is a disk error

Possible causes and remedies (Windows Failed To Start)

2-1. The device loading order is incorrect

2-2. OS cannot be recognized due to MBR error

2-3. Data cannot be read due to corruption of system files in the OS

2-4. Data cannot be read due to HDD / SSD failure

2-5. Data cannot be read due to BIOS corruption

The device loading order is incorrect

A computer is equipped with a program called “BIOS” that manages and controls parts on the internal board (motherboard), keyboard, mouse, storage, drive, etc. When the personal computer starts up, this BIOS first starts up and recognizes each part. After that, Windows and Mac OS saved in the internal storage will start up and you will be able to operate your computer. It takes time to start up the computer because these steps are performed one by one.

The BIOS is usually set to boot the OS from internal storage. However, if the setting is changed to boot from a USB memory or a USB external hard disk for some reason, the internal storage will not be recognized as a boot device, and the internal storage and Windows system files will be normal. However, the computer cannot be started.

Solution 1: Remove the USB device

Remove all devices connected to the USB terminal of your computer before starting up your computer. If the internal storage is normal, it can be started by loading it first.

Solution 2: Change the BIOS settings

If multiple built-in storages are installed, they cannot be removed like USB devices, so you need to check the BIOS settings once and restore them if the settings are incorrect. You may be able to boot by pressing the BIOS call key at boot time to boot the BIOS and undoing the settings.

Also, for some reason, the boot mode setting may be changed and you may not be able to start it. There are “UEFI” and “Legacy” in the boot mode, and old computers cannot boot with “UEFI”, so check the BIOS settings and if it is “UEFI”, change it to “Legacy”. give me.

The BIOS call key and setting method differ depending on the manufacturer and model, so refer to the instruction manual of your computer or the support page on the manufacturer’s site.

If you cannot solve the problem with the solutions 1 and 2, there may be other causes. If you cannot select the internal storage on the BIOS setting screen, the storage may be out of order. If you have important data stored on your computer, we recommend that you recover the data before repairing.

2-2. OS cannot be recognized due to MBR error

The internal HDD / SSD of a personal computer is divided into several “partitions” for storing data and “MBR (master boot record)” for managing them. When you turn on your computer, the MBR data will be read first, and then the Windows system files stored in the partition will be read. If the MBR data is corrupted, you will not be able to proceed from there and you will not be able to read the data in the partition.

Solution 1: Use a USB memory to repair the MBR error with the startup repair function

(1) Access the following URL on a normally operating computer and download the “Windows 10 Media Creation Tool”.

(2) After downloading, connect a USB memory of 5GB or more and start the Windows 10 Media Creation Tool.

(3) Connect the USB memory with Windows 10 installed to a computer that cannot boot.

(4) Boot the BIOS and set the USB memory as the first boot device.

(5) Boot from the USB memory and click “Repair your computer” at the bottom left of the screen.

(6) Enter the Windows restore environment and select “Troubleshooting”-> “Advanced Options”-> “Startup Repair” to automatically repair the MBR error.

If remedy 1 does not solve the problem, there may be another cause. Please refer to 2-3 and 2-4.

2-3. Data cannot be read due to corruption of system files in the OS

Even if the system file is damaged for some reason, the computer may not be able to find the system file and an error message such as “Operating System Not Found” may be displayed.

Solution 1: Repair system files with startup repair

Depending on the corrupted state of the system files, Startup Repair may be able to start by repeating forced termination and startup several times. After the startup repair starts, it will be repaired automatically, so please restart it after it finishes.

However, if the HDD / SSD is physically faulty, this may exacerbate the symptoms. If you have saved the necessary data on your computer, we recommend that you do not perform this operation and recover the data.

Why data recovery is needed before repair

Solution 2: Restore the system to the previous state

If the self-repair by Startup Repair fails, you can perform a further “System Restore” to return to the previous state in which it was operating normally.

Performing a system restore deletes any data saved after the restore point. If you have the data you need, we recommend that you perform a data recovery before doing this.

Why data recovery is needed before repair

Solution 3: Use the USB memory to repair the system files with the startup repair function

If you cannot solve the problem by the methods 1 to 3, the internal HDD / SSD may be defective. If you have important data stored on your computer, we recommend that you recover the data before repairing.

Why data recovery is needed before repair

2-4. Data cannot be read due to HDD / SSD failure

As mentioned above, HDD / SSD is divided into several “partitions” and “MBR”. Window system files are usually stored in the “partition” of the internal HDD / SSD. If the partition is damaged for some reason, the HDD / SSD itself may not be recognized as a boot device even though it is normal. Check the BIOS setting screen, and if the internal HDD / SSD is recognized, the partition may be damaged.

Solution 1: Use commercially available data recovery software to repair the partition

Partition corruption may be repaired with commercially available data recovery software. However, doing this can also exacerbate the symptoms. If you have important data stored on your computer, we recommend that you recover the data before performing the repair work.

Solution 2: Replace HDD / SSD

If the internal HDD / SSD is not in the list of connected devices displayed in the BIOS, the HDD / SSD may be defective. In this case, it is necessary to replace the HDD / SSD, so please consult with the manufacturer of your computer. If important data is stored on your computer, we recommend that you recover the data before requesting replacement or repair from the manufacturer.

Why data recovery is needed before repair

2-5. Data cannot be read due to BIOS corruption

As mentioned above, the computer is equipped with a program called “BIOS” that manages and controls the parts on the internal board (motherboard), keyboard, mouse, storage, drive, etc. The BIOS will boot. An error message such as “Operating System Not Found” may be displayed even when the BIOS is damaged due to the dead battery for the BIOS, the influence of electrical noise, or the failure of the BOIS update.

Solution 1: Initialize the BIOS

BIOS corruption can be repaired by initialization. In order to initialize the BIOS, it is necessary to disassemble the computer and access the inside, so it is recommended to ask the manufacturer. If important data is stored on your computer, we recommend that you recover the data before requesting replacement or repair from the manufacturer.

Why data recovery is needed before repair

If your computer needs repair, many people will ask the manufacturer or repair company. One thing to keep in mind here is that when you repair your computer, all the internal data may be initialized and returned to the state it was in when you purchased it. Before requesting, please carefully check the scope of service and precautions, understand the risks, and send it for repair.

If you have important data stored on your computer, we recommend that you consult with a data recovery company before requesting repairs to ensure the safety of your data. Even if the storage such as the internal HDD / SSD of the personal computer fails and is not recognized, if the saved data remains, it may be possible to retrieve it and recover it.

For PC data recovery, go to Advanced Design Co., Ltd

For PC data recovery, we recommend that you consult or request Advanced Design Co., Ltd., which belongs to the same Melco Group as our company.

What is Advanced Design Co., Ltd?

A data recovery company that belongs to the Melco Group, including Buffalo Inc.It is a permanent director of the Japan Data Recovery Association (DRAJ), which aims to restore sound data recovery.

Since its establishment in 1995, it boasts a large number of data recovery records.

At Advanced Design, we will always diagnose the media in advance, present the failure level and estimate, and work after you are satisfied, so please feel free to contact us. Diagnosis and estimate are free, and no cancellation fee will be charged even if you do not work after the estimate.

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