Windows Boot Error: An Operating System Wasn’t Found

If you see the “Operating System not discovered” boot error message in your laptop, it signifies that no working system bootloader has been discovered on the present disk. So, your laptop can’t discover and begin the Windows bootloader (or the bootloader of some other OS put in in your laptop).

An error you see when making an attempt as well an OS may additionally appear like this:

An working system wasn't discovered. Try disconnecting any drives that do not comprise an working system. Press Ctrl+Alt+Del to restart.

An operating system wasn't found. Try disconnecting any drives that don't contain an operating system

The similar error on Lenovo computer systems or laptops says the next:

Error 1962: No working system discovered. Boot sequence will robotically repeat.

lenovo computer: Error 1962: No operating system found. Boot sequence will automatically repeat.

Common Reasons of “Operating System not Found” Error

The most typical the explanation why an OS can’t boot with the “Operating system not discovered” error are:

  • A broken system partition, lacking or broken MBR (grasp boot file), no lively partition (or an incorrect disk partition is marked as lively);
  • A corrupted boot configuration knowledge (BCD);
  • An HDD with the put in OS isn’t linked (it might embrace such issues as poor ribbon cable connection, any points with the drive, RAID or disk controller).

operating system not found erro on Windows boot

First of all ensure that:

  1. Your arduous drive with the OS is linked to your laptop (disconnect all different drives and USB units: that is what you’re suggested to do within the first screenshot);
  2. Power and ribbon cables are linked correctly;
  3. The arduous drive is detected within the BIOS/UEFI of your laptop. Make it the first boot machine;
  4. Check the Secure Boot settings in UEFI. They could have been modified (test if Windows is booted with the Secure Boot mode enabled/disabled and within the Legacy mode).

If you probably did the whole lot described above, and your Windows nonetheless doesn’t boot, you’ll have to restore the Windows bootloader and disk boot file.

Identify Disk Partition Table & Windows Partition

In order to restore your bootloader, you will have a Windows set up media (on a CD/DVD/ ) or rescue disk with the identical OS model you may have put in in your drive (or newer).

Change the boot order in BIOS (UEFI), boot out of your set up/rescue disk and run the command immediate (in case you are utilizing Windows 10 set up media, press Shift+F10 on the language choice display screen). run command prompt from windows install media

First of all, you will need to detect the kind of the partition desk in your disk: GPT or MBR. The methodology for restoring the Windows bootloader depends upon it.
Enter this command: record disk
If there may be an asterisk (*) within the Gpt column to your disk, than the GPT partition desk is used, in any other case it’s MBR.

windows diskpart - get disk partition table gpt or mbr

Display the record of volumes on the disk:

record vol

list volumes

Exit the diskpart session:
Judging by the disk dimension, Windows is more likely to be put in on E: drive. Check it by operating this command:
dir e:

As you possibly can see, there are Windows, Program Files, Users and different normal folders on the drive.

identify windows partition

So we have now detected the disk structure sort and the drive letter of the disk Windows is put in on. Depending on the disk partition desk you may have, go to the corresponding part of this text.

How to Repair the Windows Bootloader on the MBR Disk?

We suppose that your laptop is utilizing BIOS and the disk partition desk is MBR.

Create bootloader configuration recordsdata on the E: drive:

bcdboot E:Windows /S E:

The “Boot recordsdata efficiently created” message will seem.

bcdboot - recreate windows boot files on mbr disk

Re-create a Master Boot Record (MBR):

bootrec.exe /FixMbr
bootrec.exe /RepairBoot
bootrec.exe /RebuildBcd

Make your Windows partition lively (BIOS transfers management to the OS bootloader on the lively MBR partition):

record disk
sel disk zero
record vol
choose quantity 2
(earlier we detected that Windows is put in on this quantity)

make windows partition active

Restart your laptop and ensure that Windows has booted accurately and the “Operating system not discovered” error has not appeared.

How to Repair the EFI Bootloader on a GPT Disk of UEFI Computer?

If your disk has the GPT partition structure, it signifies that your laptop is utilizing the UEFI structure as an alternative of BIOS. You can discover the entire information on the right way to restore Windows 10 bootloader on a UEFI-based laptop within the following article: Let’s think about the primary steps briefly.

First of all, discover a FAT32 hidden partition and assign a drive letter to it (the dimensions of this partition is 100-300MB, it’s used to retailer the Windows bootloader which known as by the EFI bootloader).

List vol

For instance, you may have detected that it’s Volume 1 with the label BOOTSTRAP.

diskpart - detect efi partition

Select this EFI partition and assign a drive letter to it:

choose quantity 2
assign letter M:

Re-create the BCD bootloader configuration file:

cd /d m:efimicrosoftboot
ren BCD BCD.bak
bcdboot E:Windows /l en-us /s M: /f ALL

The E:Windows path is used, since earlier we detected that on this instance Windows was put in on E: drive.

Reboot your laptop, take away the boot media (USB flash drive) and ensure that Windows has booted accurately.

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