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How to Fix Computer turns off automatically

Is your computer turning off by itself? You can’t even log in to your PC as it automatically shutdowns before you could even type the password? Then don’t worry as you’re among thousands of users who face this issue every year and the most probable cause of this issue is overheating of your PC. Well, the issue occurs somewhat like this:

Your PC will suddenly shut down while you’re using it, no warning, nothing. When you try to turn it back on, it will start normally, but as soon as you get to the login screen, it will again turn off automatically, just like before. Some users get past the login screen and can use their PC for a few minutes, but ultimately their PC also shut down again. Now it just stuck in a loop and no matter how many time you restart or wait for few hours before restarting you will always get the same results, .i.e. your computer will turn off itself, no matter what you do.

How to Fix Computer turns off automatically

In cases like this users try to troubleshoot the issue by disconnecting keyboard or mouse, or starting PC in Safe Mode, etc.. but the outcome will be same, which is the PC will turn Off automatically. Now there are only two main reasons that can cause your system’s sudden shutdown, the faulty power supply or overheating issue. If a PC gets over the pre-configured temperature, the system will shut down automatically. Now, this happens to avoid damaging your PC, which is a failsafe. So without wasting any time let’s see How to Fix computer turns off automatically with the help of the below-listed troubleshooting guide.

How to Fix Computer turns off automatically

Make sure to create a restore point, just in case something goes wrong.

Method 1: Run CCleaner and Malwarebytes (If you can log in to Windows)

1. Download and install CCleaner & Malwarebytes.

2. Run Malwarebytes and let it scan your system for harmful files. If malware is found, it will automatically remove them.

Click on Scan Now once you run the Malwarebytes Anti-Malware

3. Now run CCleaner and select Custom Clean.

4. Under Custom Clean, select the Windows tab and checkmark defaults and click Analyze.

Select Custom Clean then checkmark default in Windows tab | How to Fix Computer turns off automatically

5. Once Analyze is complete, make sure you’re certain to remove the files to be deleted.

Click on Run Cleaner to deleted files

6. Finally, click on the Run Cleaner button and let CCleaner run its course.

7. To further clean your system, select the Registry tab, and ensure the following are checked:

Select Registry tab then click on Scan for Issues

8. Click on the Scan for Issues button and allow CCleaner to scan, then click on the Fix Selected Issues button.

Once scan for issues is completed click on Fix selected Issues | How to Fix Computer turns off automatically

9. When CCleaner asks “Do you want backup changes to the registry? select Yes.

10. Once your backup has completed, click on the Fix All Selected Issues button.

11. Restart your PC to save changes.

Method 2: Turn Off Fast Startup

1. Press Windows Key + R then type control and hit Enter to open Control Panel.

control pannel

2. Click on Hardware and Sound then click on Power Options.

Click on 'Power Options' from the list

3. Then, from the left window pane selectChoose what the power buttons do.

Click on Choose what the power buttons do in the top-left column | How to Fix Computer turns off automatically

4. Now click on Change settings that are currently unavailable.

Click on Change settings that are currently unavailable

5. Uncheck “Turn on fast startup” and click on Save changes.

Uncheck Turn on Fast startup under Shutdown settings

Method 3: Issue with operating system

The issue maybe with your operating system rather than the hardware. To verify if this is the case, you need to Power ON your PC and then Enter BIOS setup. Now once inside BIOS, let your computer sit idle and see if it shut down automatically as before. If your PC doesn’t shut down, then this means your operating system is corrupt and needs to reinstall it. See here how to repair install Windows 10 to Fix Computer turns off automatically.

Method 4: Detecting Overheating Issue

Now you need to verify if the issue is merely caused by overheating or the faulty power supply, and to that, you need to measure your PC’s temperature. One of the freeware to do this is Speed Fan.

Detecting Overheating Issue

Download and run the Speed Fan application. Then check whether the computer is overheating or not. Check whether the temperature is within the defined range, or is it above them. If your Temperature reading is way above normal, then this means it’s a case of overheating. Follow the next method to solve the overheating issue.

Method 5: Cleaning the dust

Note: If you’re a novice user, don’t do this yourself, look for professionals who can clean your PC or laptop for dust. It’s better to take your PC or laptop to the service center where they would do this for you. Also opening the PC case or laptop can void the warranty, so continue at your own risk.

Cleaning the dust | How to Fix Computer turns off automatically

Ensure clean dust settled on Power Supply, Motherboard, RAM, air vents, hard disk and most importantly on Heat Sink. The best way to do this is to use a blower but make sure to set its capacity to the minimum, or you will damage your system. Don’t use a cloth or any other hard material to clean the dust. You could also use a brush to clean dust from your PC. After cleaning the dust see if you’re able to Fix Computer turns off automatically issue, if not then continue to next method.

If possible see if the heatsink works while your PC powers ON if the heatsink doesn’t work, you need to replace it. Also, make sure to remove the Fan from your motherboard and then clean it using a brush. If you use a laptop, it would be a good idea to buy a cooler for the laptop, allowing heat to pass from the laptop easily.

Method 6: Faulty Power Supply

First, of all check, if there is dust settled on Power Supply. If this is the case, try to clean all the dust on the power supply and clean the fan of the power supply. If possible, try to turn ON your PC and see if the power supply unit works and check if the fan of the power supply is working.

Faulty Power Supply

Sometimes a loose or faulty cable can also be the problem. To replace the cable which connects the power supply unit (PSU) to the motherboard, check if this fixes the issue. But if your computer still turns off automatically without any warning, you need to replace the whole Power Supply Unit. While purchasing a new power supply unit, check its ratings against the recommended ratings by your computer manufacturer. See if you’re able to Fix Computer turns off automatically issue after replacing the Power Supply.

Method 7: Hardware related issues

If you have recently installed any new hardware component, then it causes this issue where your Computer turns off automatically. Even if you haven’t added any new hardware, any failing hardware component can also cause this error. So make sure to run a system diagnostic test and see if everything is working as expected.

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That’s it you have successfully learned How to Fix Computer turns off automatically issue but if you still have any queries regarding this guide then feel free to ask them in the comment’s section.

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Aditya Farrad

Aditya is a self-motivated information technology professional and has been a technology writer for the last 7 years. He covers Internet services, mobile, Windows, software, and How-to guides.

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