Computer Won't Turn On? How to Fix and Troubleshoot a Non-Bootable PC

Do you know what to do when your computer exhibits one or two of these symptoms:

• The computer powers on but does not start up.
• The computer won't turn on or charge.
• The power adapter has a green light, but the computer won't turn on.
• The computer won't start, but the motherboard light is on.
• The computer fails to boot with a black screen.
• The computer is plugged in but still won't turn on.

When this happens to your computer, stay calm and follow this quick guide to see if the issue can be resolved:

1. Step 1: Turn off your computer, disconnect any external USB devices, and charge your computer using the power adapter.
2. Step 2: Restart your computer and wait for it to load.

If your computer starts up normally, congratulations! You can stop here.

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Why Won't My Computer Turn On - Reasons

So what could be keeping your computer from turning on? Or, do you know what could be keeping your computer from turning on? There are two broad categories of reasons why your computer won't turn on or boot up:

• Physical cause
• Logical cause

Here is a list of possible reasons why a computer might not turn on:

It's okay if you're not able to pinpoint exactly why your computer won't turn on; simply browse the symptoms below and follow the associated troubleshooting guide to get your computer up and running again.

• 1. Computer Won't Turn On, But Motherboard Lights Are On/It's Plugged In
• 2. Computer Won't Boot After Updating or Rebuilding Windows (Gaming PC Issue)
• 3. PC Won't Start Up, Showing Blue Screen or Black Screen
• 4. Dell, HP, Lenovo, Asus/Acer Laptops/Desktops Won't Turn On

Fix 1: Computer Won't Turn On, But Motherboard Lights Are On/Plugged In

Applicable to:

• The computer won't turn on, but the power light is on.
• The computer won't start even when plugged in.
• The computer fails to boot up, but the motherboard has power.
• The computer still won't turn on after replacing the power cable.
• The computer suddenly stopped turning on.

Assuming you've tried restarting the computer and confirmed that the power cord is in good condition and properly plugged in, the issue could be with the power supply, the battery, the display, or a virus infection.

Please follow the instructions below to resolve the issue and restore your computer to its normal state:

#1. Restart your computer

• Press and hold the power button to turn off the computer.
• Press the power button to turn on the computer.
• Repeat this process 3-5 times to see if your computer will turn on.

Wait patiently without interrupting the process. If your computer boots up, you're done. If not, try the next method.

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#2. Charge your computer

• Try using a different power adapter to charge your computer.
• Charge your computer for 10 minutes.
• Afterwards, press the power button to see if your computer turns on.

If so, you're done – provided you have a fully charged computer battery.

If not, try removing the laptop's battery and powering it up with just the AC adapter. If this works, you know the problem is with the battery. If not, move on to the next step.

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#3. Check the motherboard lights (for desktops)

• Plug the computer into a power source and charge it.
• Open the computer case and look for flashing lights on the motherboard.

If it does, the problem is the battery, and you need only replace it.

If not, move on to the next suggestion.

Read more: Windows 11 Black Screen with Cursor

#4. Check and replace the display

This approach requires that you have a second, healthy monitor at home or in the office. Here's how it works:

Try replacing the display cable and see if your computer boots. First, disconnect your computer from the monitor. Next, connect a known good display to your computer. Press the power button and see if your computer turns on.

If so, you can stop the troubleshooting here and simply replace the problematic display.

If not, try the next tutorial guide.

#5. Boot in Safe Mode and scan for viruses

• Shut down the computer, then press the power button for 10 seconds.
• Shut down the computer again and hold the power button for another 10 seconds.
• Shut down the computer once more and restart it by holding the power button for 10 seconds.
• Repeat this process until your computer turns on and loads into WinRE (Windows Recovery Environment).
• Select “Troubleshoot > Advanced options > Startup Settings > Restart.”

• Log in to your computer using your account and password.
• Run an antivirus software scan and remove the virus from your computer.

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Fix 2: PC won't start after Windows update or rebuild (gaming PC freeze)

If your PC won't start after installing the latest Windows updates, or you rebuilt your PC and it won't boot, don't worry. You'll find solutions for getting a gaming PC that won't start up and running again here, too.

Applies to:

• The computer doesn't respond when you press the power button.
• The computer won't start after a Windows update.
• The computer won't start after a Windows system rebuild or reinstall.

So how do you fix a Windows or gaming PC that won't turn on? Try these steps to get your computer up and running again:

#1. Explore BIOS and configure BIOS settings

Sometimes, after installing new Windows updates, your PC might not start because of a BIOS setting. You can enter the BIOS and configure the BIOS settings:

• Press the power button on your computer to restart it while holding down the F2, F8, F11, or Del key.
• Wait for the computer to enter the BIOS setup screen.
• Navigate to the Boot menu and confirm or set the drive where your operating system is installed as the first boot device.

Set the OS drive as the boot drive:

Note that if you're using Windows 11, you'll also need to enable UEFI mode and Secure Boot in your BIOS.

• Go to the “Boot” tab and select “UEFI/BIOS Boot Mode,” and check if the boot mode is set to UEFI. • If not, switch to UEFI and save the changes.

1. Navigate to the "Security" tab and select "Secure Boot" option, switching the mode from "Disabled" to "Enabled."
2. Save the changes and restart your computer.

If that doesn't work, try the next one.

#2. Repair the Master Boot Record (MBR)

Another issue that might prevent your computer from booting is a corrupted MBR which is responsible for loading the operating system files and information. The only solution to this problem is to perform a MBR repair.

Skilled Windows users can rebuild MBR boot sector via CMD. But for most Windows beginners, this seems complicated. A reliable partition manager - tools Partition Master stands out to help.

Its “Rebuild MBR” feature lets Windows users of all levels fix this problem with just a few clicks:

Step 1. Create a bootable Windows PE disk

Launch Partition Master, and click “Bootable Media” from the toolbar. Select “Create Bootable Media.” Click “Next” to finish the process.

Create a Bootable Disk

Step 2. Boot into Partition Master Live USB

Connect the bootable USB or CD/DVD to your computer. Restart your PC and press F2 or Del to enter the BIOS screen. Set it to boot from “Removable Device” or “CD-ROM Drive.” The Partition Master tool will then run automatically.

Step 3: Rebuild the MBR

Click on “Toolbox,” and then select “Rebuild MBR.”

Select the disk and MBR type, then click “Rebuild”.

Then you'll see the message “MBR on Disk X has been successfully rebuilt.”

#3. Undo Problematic Windows Updates

When you encounter problematic Windows updates, such as an unstable Windows 11 update, you can follow this guide to roll back to an earlier version:

1. Enter Windows Settings and click on "System > Recovery." 2. In the "Reset this PC" section, click on "Go back." 3. Answer the following questions: "Why do you want to go back," "Check for updates?," "What do you need to know," and "Prevent being locked out."

Click “Revert to an earlier version.”

Please follow the instructions on the screen to complete the operation.

#4. Reinstall Windows

When a rollback doesn't work, you can also reinstall Windows to fix issues where your PC won't start after an update or a reset.

1. Download the Windows 11 or Windows 10 ISO image. 2. Create a Windows installation media using a blank USB (8GB or larger). 3. Set your BIOS to boot from the USB drive and restart your computer. 4. If you're installing Windows 11 on a GPT partition, enable UEFI and Secure Boot mode. 5. After your computer boots up, select the USB flash drive as the media to use. 6. Click "Install Now" and configure details like the product key, edition, and language. 7. Follow the on-screen instructions to complete the Windows installation process.

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Fix 3: Computer won't turn on, displaying blue screen and black screen issues

Another common symptom of a non-bootable computer is a blue screen error, where the computer seems to turn on but doesn't do anything else.

Applies to:

• My laptop turns on but has no display screen (black screen).
• The computer restarts without any response.
• The laptop fails to boot up, showing a blue screen error.

If the black screen of death appears after you restart your PC, try rolling back to Method 1 and fixing any battery, power, or display issues.

If the problem persists, you can try the following:

#1. Reset the hardware

• Disconnect all connected storage devices, then restart your computer. • Press F2/F8/F11 to enter BIOS. • Go to the "Save & Exit" section and select "Load Optimized Default Settings." • Save the changes and exit BIOS to restart your computer.

#2. Check for Beep Sounds - Boot-up Sounds

Restart the computer and listen for beeps from the motherboard.

1. A single beep is normal.
2. Continuous long beeping indicates a power problem or an incorrect power connection.
3. A series of short and long beeps may indicate a serious problem with your computer.

- For a single beep, simply restart the computer. - For a long, continuous beep, check the power cord and charge the computer. - For a series of short and long beeps, shut down the computer and take it to a local repair center for further inspection.

#3. Check and fix damaged hard drives

When a computer's hard drive contains corrupted file system errors or bad sectors, it may fail to boot. To address this issue, you can use the “Disk Check” feature in Windows to scan for disk errors:

Restart your computer several times using the power button to get into Safe Mode.

You can follow this guide to boot your computer into Safe Mode.

1. Open File Explorer in Windows, right-click on the problematic disk, and select "Properties." 2. Switch to the "Tools" tab, and under Error checking, click "Check." 3. Click "Scan Drive" or "Scan and repair" to fix any corrupted file system issues on the disk.

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Run CHKDSK to Check and Repair Disk Errors

Aside from using the Scan Drive feature, you can also apply CHKDSK to fix hard drive errors and get your computer started normally. Let's see how to solve this issue.

#4. Upgrade and migrate the operating system to a new disk

One of the most severe issues could be a Windows computer that fails to boot due to a hard drive problem. When the hard disk contains too many bad sectors, file system errors, or other unknown issues, the computer might be unable to access and boot the operating system from it.

In that case, you'll need to migrate your system to the new disk. Here's a complete guide to upgrading your operating system to a new disk on an unbootable computer:

< strong > 1. Install a new hard drive or SSD

• Get a new hard drive or SSD with a capacity equal to or greater than the used space on your old operating system's disk. • Install the SSD or HDD in your computer.

Utilize the tool Partition Master to create a WinPE boot disk.

Step 1. Create a Bootable Disk Partition Master Tool To get started, you need to prepare a storage media such as a USB drive, a flash drive, or a CD/DVD disc. Then, connect the drive properly to your computer.

Step 2: Launch Partition Master, and on the left side, find the “Bootable Media” feature and click it.

Step 3. If you have a USB drive or CD/DVD connected, you can select it here. If you don't have a storage device, you can also save the ISO image to your local drive and burn it to media later. When you're ready, click "Create" to start the process.

Review the warning, and then click Yes.

Step 4. When the process is finished, you'll see a pop-up asking you if you want to reboot your computer from the bootable USB drive.

• Restart now: You want to restart your computer immediately and then manage disk partitions without an operating system using the boot tool.
• Finish: You don't want to restart your current computer, but instead want to use the bootable USB drive on a new one.

Note: To use the bootable disk on a new computer, you need to restart the target computer and press F2/F8/Del to enter the BIOS, and then set the USB boot disk as the first boot device.

Be patient, and your PC will boot from the USB drive and load the WinPE desktop.

3. Boot the computer from the Partition Master WinPE bootable disk.

• Press the power button on your computer and tap F2/F8/F11 or Del while it's booting to enter BIOS.
• Set your computer to boot from the bootable disk.
• Wait for the Partition Master tool to launch.
• Right-click the new disk, select "Initialize Disk," and set it as your operating system disk—MBR or GPT.

4. Upgrade and migrate to the new disk

Now you can use the Partition Assistant tool to migrate your Windows installation to the new disk.

< strong > Steps to migrate the operating system to an HDD/SSD:

Launch AOMEI Partition Assistant, and from the left menu, select "Clone." Tick "Migrate OS" and click "Next." Choose the SSD or HDD as the target disk and then click "Next." Note: All data and partitions on the target disk will be deleted. Make sure you have backed up your important data in advance. If not, please do it now. Then click "Yes." Preview the layout of the target disk and click "Start" to begin migrating the operating system to the new disk.

5. Click “Restart Now” or “Finish” to decide whether you want to restart your computer from the new disk right away.

“Restart now” means to apply the changes immediately, whereas “Finish” means you'll need to restart your computer later, manually.

Note: If there is insufficient unallocated space on the target disk, the OS migration operation will delete existing partitions and data on the target disk. Back up any important data to an external drive beforehand if necessary.

5. Set the new disk as the boot drive and make the computer bootable

• After the OS migration is complete, close Partition Master and shut down your computer. • Restart your computer and enter the BIOS. • Access the boot menu and set the new disk as the boot drive. • Save the changes and restart your computer.

All you have to do now is wait for the recovery process to finish, and your computer will start up normally again with all your stuff on the desktop.

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Troubleshooting: Dell, HP, Lenovo, Asus/Acer Laptops/Computers Not Turning On

On this page, we explain the possible logical and physical reasons why a computer might not turn on, and offer various solutions for each issue:

• 1. Computer won't turn on, but the motherboard light is on/plugged in
• 2. Computer won't boot after a Windows update or rebuild (gaming PC issue)
• 3. Blue screen and black screen issues upon PC startup

If any of these issues happen to be on your Dell, HP, Lenovo, Asus, Acer, or another brand of computer, you can use the respective tutorial guide to fix it yourself.

Here are some general steps you can try to fix issues with a Windows PC that won't turn on:

• Check the power supply
• Replace the CMOS battery
• Solve overheating issues
• Inspect the monitor
• Scan for malware or viruses
• Boot in Safe Mode
• Disconnect external devices
• Inspect or replace the hard drive

Here are two more troubleshooting guides you can follow to address issues with your computer not starting:

Troubleshooting 1: No Boot Device Found

【Error Reason】: No bootable storage device detected or enabled.

Correction:

• Check the BIOS settings and boot order
• Set the primary partition as active
• Inspect the internal hard drive status
• Create Windows boot media

Step-by-Step Guide: How to Fix the "No Bootable Device Found" Error Click here for the tutorial

Troubleshooting 2: Your PC has encountered a problem and needs to restart

Error Reason:

• Registry modifications
• Damaged system files
• Problematic drivers
• Virus or malware infection
• Cable connections loose on the hard drive
• Incorrect system shutdown

Fix:

• Boot into Safe Mode
• Check for disk errors
• Extend the C drive space
• View System Logs
• Perform a System Restore
• Restore Registry Settings

Step-by-Step Guide: [Link] 10+ Solutions to "Your PC Encountered a Problem" in Windows 11/10

If your issue gets resolved here, congratulations! Also, if you've tried all the solutions on this page and your computer still won't turn on, don't worry.

Our Technical Support team also offers personalized assistance to help with issues preventing your computer from turning on. Please visit our Remote Assistance page to request online support. Our technical team is ready to assist you.