When you go to work on your office desktop or home computer, the first thing you do is turn it on and all associated peripherals. Normally, what follows is to wait for the computer to complete all the previous processes so that it can load the operating system and start using it. However, it is possible that your PC has failed to start with Windows 10 and gives you an error, do you want to know how to repair Boot Loader BCD startup? Read on to do it yourself.
One of the errors that can appear on boot is related to the Boot Loader BCD. BCD stands for Boot Configuration Data in English (boot configuration data) and its function is to store all the information about the boot or startup of the operating system and which ones are installed.
Why won’t Windows 10 boot or Boot Loader start corrupted?
There are various reasons why Windows 10 won’t boot or why the BCD may be damaged or corrupted, which may be as follows:
- The equipment has not been turned off correctly, perhaps due to a power failure.
- There has been a forced system restart due to some unknown error, therefore the profile cannot be loaded (like the famous blue screen).
- Some important data stored on the hard drive has been corrupted.
- Hard drives are failing or some of their sectors are bad, or other component damage.
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Malicious software has infected the machine, such as malware, viruses, Trojans, etc.
- Very saturated RAM memories, which you will have to free and optimize said memory.
If it is a hardware problem, the damaged component may need to be replaced. But if the failure is due to a software problem, you can try to solve it yourself and we will explain it to you below.
Steps to repair Boot Loader startup in Windows 10
To carry out this process we can use the diagnostic or repair tools that the operating system itself gives us and for this we must have a Windows 10 installation disk, either on a physical disk or create a bootable USB flash drive. We will explain two methods, manual repair step by step with commands or automatic repair.
Before explaining the methods, it should be noted that it is required to start the system from the installation disk or flash drive, so you will first have to go to the BIOS boot menu to be able to select that option.
For that, restart the computer, enter the boot menu by pressing the corresponding key (varies depending on the model: F8, F10, F12 or ESC). Then select the boot device.
Method 1: Repair by using commands.
Once you boot the system with the Windows 10 boot disk with a USB flash drive or disk, you need to repair the system BCD. To do this, follow these steps:
- Select Repair your computer. Then select the Troubleshoot option and then select Advanced Options. Then select Command Prompt.
- Once the box is open, enter the command diskpart, sel disk 0, list vol. (by pressing the enter key after each command). Thus, the main disk has been selected and the volumes that compose it have been listed.
- Then select the volume that contains the Windows startup, which generally weighs 500 MB and is No. 2. To do this, write the command sel vol. 2, assign letter=G:(press enter each time)
- When Diskpart assigns the drive letter, type the commands exit, cd /d G:EFIMicrosoftBoot,
cd /d G:Boot or cd /d G:ESDWindowsEFIMicrosoftBoot, bootrec /fixboot, ren BCD BCD.bak
bcdboot C:Windows /l en-us /sx: /f ALL. (press enter each time)
Type: exit and then restart the PC.
Method 2: Repair using the system automatically.
Once you boot the system with the Windows 10 boot disk with a USB flash drive or disk, you need to repair the system BCD. To do this, follow these very simple steps:
- Select Repair your computer. Then select the Troubleshoot option and then select Automatic Repair.
- Wait for the process to finish.
This method is the easiest because you avoid entering commands in which you can make a mistake.
If the above methods don’t work, try starting Windows 10 in safe mode or reinstalling the system. Now you know how to fix Boot Loader startup when Windows 10 won’t start.