After a blackout the PC does not boot? this is how you fix it

Windows won’t boot after a power outage

If Windows is unable to boot after a power outage, the problem is usually caused by this sudden power failure. This causes system files get damagedthe boot configuration data (BCD) becomes corrupted, preventing them from finding the boot path.

In the event that this occurs, we must perform the following actions:

  • We disconnect the power cable from your PC.
  • We remove the VGA/HDMI cable, USB keyboard and mouse, and other external devices.
  • We hold down the power button on the computer for 10 seconds (no power)
  • We release the power button, to later reconnect the power supply to the computer.
  • We restart the PC.

In case this does not solve the problem and Windows still cannot start correctly, we should not despair since there are other ways to put an end to this annoying problem.

Troubleshooting steps

Next, we are going to see different actions that we can carry out to make Windows able to start up normally after a power failure.

Run startup repair

In this case, if we are able to access the advanced boot options screen, then we can run the option startup repair. This is an automated system of the operating system itself that, once we put it into operation, runs by itself without us having to do anything and through which it allows us to solve the problems that prevent Windows from loading.

To do this, we must click on the Advanced Options and then click on Solve problemsfollowed by Advanced Options and lastly in startup repair.

Windows itself will then look for possible internal problems with the software startup in order to fix them automatically. Therefore, once we activate it, we only have to wait for the process to be carried out and to repair any damage to the system that allows us to start Windows again.

Repair BCD

Sudden power loss can sometimes corrupt system files and also corrupt system reserved partitions like backup data. boot configuration (BCD). This BCD corruption can cause problems starting the Windows system.

From the Advanced Options section we can see the options that we have available at that moment, so we opted for the call Command Prompt.

open command prompt

Once we have accessed the Command Prompt we have to type the following commands to try to repair the BCD

bootrec /fixmbr

With this command we manage to write a new Windows Bootable MBR.

bootrec /fixboot

In this way we will be able to write a new boot sector in the system partition and at the same time the damaged sectors are fixed.

bootrec /rebuildbcd

And, finally, we only have to analyze the hard drives of the PC to detect Windows and add it to the BCD solved the failure.

After executing these commands, we return to Restart your computerafter which it should work again and start without problems.

Run System File Checker

The outage may have caused problems with some system files, preventing Windows from booting properly. If this is the case we can make use of the System File Checkerboth to be able to repair it and to re-download the damaged or missing files.

open command prompt

To do this, from the Command Prompt we will write the following command and press Enter:

DISM.exe /Online /Cleanup-image /Restorehealth

This will run the DISM (Deployment Image & Servicing Management) tool to repair corrupted files that are preventing the system from working properly. This will take care of scanning and downloading the system files necessary for Windows to reboot properly.

Next, we press this other command and press Enter:

sfc /scannow

This command will be responsible for scanning the PC for lost or damaged files in order to replace it with the stable copy downloaded by DISM, so it is also important that we run it.

Once finished, we restart the computer, typing the following command and pressing Enter.

shutdown /r

Repair PC using installation media

If nothing helps, we may need to boot from Windows bootable media. If we have one Windows bootable USB stick, CD or DVD we must connect it or put it in the PC reader and try to boot the computer from it.

Plug in the drive containing the Windows installation files and press the power button. Later we press Enter or any key to start from the device and select the option Repair the computer.

repair the computer

Advanced Startup Options, click Command Prompt, which opens the Windows Symbol of the system.

open command prompt

Here we write the following command and press Enter:

bootrec /fixmbr

If everything goes well we will see the message The operation has been completed successfully.

Now we write the following commands and execute them individually:

bootrec /fixboot bootrec /rebuildbcd

Through them, the Windows installation will be scanned and it will be in charge of solving any problem that they find.

If the command identifies any Windows installations, type Y either A and press Enter to add the installation to our startup list.

Finally, we restart the PC from the Command Prompt with this command:

shutdown /r

Do a fresh install of Windows

If after having carried out all the previous steps, we still cannot get our computer to start, we have to consider a more drastic optionand it is possible that the power outage has caused irreparable damage to the operating system that prevents it from starting correctly again.

In this case, we will have no choice but to do a new installation of Windows, format the disk and install the operating system again or replace the disk with a new one and do a new installation of everything. This will cause us to lose all the files that we have stored in the system, as well as all the applications that we have installed.

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