Computer Won’t Turn on or Boot After Power Outage, what to do?

There may be several reasons for it, include a dead or faulty power supply, a damaged motherboard, a malfunctioning hard drive, or a problem with the RAM.

A power outage is not always harmful to your computer but power surge that may occur before a power outage is more harmful to your computer. Sometimes you may experience, windows won’t boot after a power outage or the computer turns on but no display after power outage. Or in the worst case, scenario computer won’t turn on after a power outage. Here in this post, we try to find out, Why Computer Won’t Boot After Power outages and how to fix such problems.

Why windows 11 Won’t Boot After a Power outage?

This is because windows OS are complex and must go through a shutdown sequence to ensure all running process are terminated before power is off. And a sudden loss of electricity will interrupt this shutdown sequence which not only affects system files or just damage software, it can also cause accumulative damage to your hard drive. And that may result windows 11 computer won’t boot after a power outage.

Computer won’t turn on after a power outage

Let’s check first what to do if the computer won’t turn on after the power outage and the second part we check what to do if the computer turns on but windows won’t boot after a power outage.

If your computer won’t turn on at all, check the outlet, powerbar, or power source it is plugged into.

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Check The Power Supply Source

If your computer won’t turn on the first thing you need to check is whether all the connections are made properly. Check the power supply cable for loose connection, if necessary unplug and plug them all.

In addition, Open the PC cabinet and turn on the PC. Check if the CPU Fan turns on or not. If no, then the power supply is likely at fault. Sometimes faulty SMPC (switch mode power supply) also causes such problems. When you turn on your PC check if a green led light lights up. If not, then it means that the SMPS has been affected by the power surge

If you have a spare power supply or SMPC, try replacing it and see if it works.

Power Reset on your computer or laptop

If you notice when you turn on your PC the green led light is blinking but the computer won’t start, reset your PSU (power supply unit), after which your PC should start normally. To reset your PSU, drain the power completely and charge it up again. Plug it back.

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If you are experiencing this issue with your laptop, then one thing you can try is reset the power. And that fixes most minor issues affecting the laptop and result laptop won’t turn on.

Power reset Laptop

  • First, switch off the power socket and unplug the laptop charging cable
  • Next Open the laptop’s back cabinet and Remove the battery.
  • Press and hold the Power button of the laptop for 5 seconds and then Release the power button.
  • Now Plug the battery back in and turn on your Laptop.

Power reset computer

  • If you are on a desktop computer then make sure to turn if off or disconnect the power cable.
  • In addition remove everything connected to the desktop cabinet, that include external devices, VGA cables, keyboard mouse or anything else,
  • Now press and hold the power button for 10 sec, to power reset your computer.
  • connect everything and try to turn on your computer, check if this helps.

Windows 11 won’t boot after a power outage

If your computer Turn on but won’t boot after a power outage there are chances the Boot Configuration Data (BCD) file is corrupted or system files are corrupted. You can perform automatic repair or rebuild BCD files using advanced command prompt windows to fix the problem.

Automatic repair windows 11 PC

Hence windows won’t boot normally you first need to access advanced options to get a startup repair or command line tool to repair such problems. shutdown windows two or three times and see whether it boots in the Advanced Startup Options, if not you need to boot from installation media to access advanced options on windows 11.

Automatic repair fix boot-related issues when a startup problem arises automatically

  • Boot from the installation media and skip the first screen
  • On the next screen click on repair your computer, then select advanced Startup” followed by Troubleshoot option.
  • Here you will get the option Advanced options, click on it and now you have access to several troubleshooting features.
  • Click on the Automatic repair option and follow on-screen instructions.

Advanced Boot options on windows 10

This will scan and fix the most common issues that may be preventing your computer from booting into the operating system. Let the repair process complete and restart your PC check computer start without any error.

Rebuild Boot Configuration Data

If the startup repair fails to fix the problem then there is a chance, the boot configuration data file corrupted due to sudden power failure and prevent windows 11 start normally.

Again access advanced options and click on the command prompt, now perform the following commands one after each.

  • bootrec.exe /rebuildbcd
  • bootrec.exe /fixmbr
  • bootrec.exe /fixboot

The above command rebuild Windows Boot Manager, BCD configuration file, and fix MBR on Windows 11.

Once done run the DISM command Dism /Online /Cleanup-Image /RestoreHealth and the system file checker command sfc /scannow to scan and repair damaged system files on your computer.

And finally, reboot your PC and check if windows 11 boots normally without any error.

Still need help try the system image recovery option or system restore and check if this helps.

If the above solutions don’t work, we recommend get a technician from your device’s manufacturer to check it.

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