industrialtotal.blogg.se - Error finding your systems active partition

The method for restoring the Windows bootloader depends on it. In order to repair your bootloader, you will need a Windows install media (on a CD/DVD/ bootable USB drive) or rescue disk with the same OS version you have installed on your drive (or newer).Ĭhange the boot order in BIOS (UEFI), boot from your installation/rescue disk and run the command prompt (if you are using Windows 10 install media, press Shift+F10 on the language selection screen).įirst of all, you must detect the type of the partition table on your disk: GPT or MBR. Identify Disk Partition Table & Windows Partition If you did everything described above, and your Windows still doesn’t boot, you will have to restore the Windows bootloader and disk boot record. They may have been changed (check if Windows is booted with the Secure Boot mode enabled/disabled and in the Legacy mode).

Check the Secure Boot settings in UEFI.

The hard drive is detected in the BIOS/UEFI of your computer.

Power and ribbon cables are connected properly.

Your hard drive with the OS is connected to your computer (disconnect all other drives and USB devices: this is what you are advised to do in the first screenshot).

An HDD with the installed OS is not connected (it may include such problems as poor ribbon cable connection, any hardware issues with the drive, RAID or disk controller).

A corrupted boot configuration data (BCD).

A damaged system partition, missing or damaged MBR (master boot record), no active partition (or an incorrect disk partition is marked as active).

The most common reasons why an OS cannot boot with the “ Operating system not found” error are:

Common Reasons of “Operating System not Found” Error