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How to Fix Windows PC That Doesn't Turn on Start Up

Authored by:
Support.com Tech Pro Team
This Guided Path® was written and reviewed by Support.com’s Tech Pro team. With decades of experience, our Tech Pros are passionate about making technology work for you. We love feedback! Let us know what you think about this Guided Path® by rating it at the end.

Introduction

It can be an awful feeling to press the power button on your Windows PC and for it to not turn on. If you don't hear any beeps or a startup chime, you don't hear any fan or drive noise, you don't see any indicator lights turn on and the screen is blank, then your computer may not be getting power. Do not panic! This guide will provide some basic troubleshooting steps that may get your PC up and running in no time.
Computer power button about to be pressed.

1 Check to See if the Outlet has Power

  1. Make sure you are using a working power outlet. You can test another electric device, such as a lamp, with the same power outlet. Bypass any power strips for troubleshooting purposes.
    Turned on lamp plugged into power outlet.
  2. Once you made sure the power outlet is working, firmly plug in your device into the working outlet.
    Power cable plugged into power outlet.
  3. If the device has buttons or a remote control, press the power button to turn the device on.
    Power symbol.

2 Ensure the Computer is Powered

There are multiple different Windows systems that have different ways to check for the proper power set up. Click the one that matches the model you have and follow the steps to make sure your PC is properly powered up.

Laptop
  1. A laptop PC has an external power supply and connects like below:
    • One connector (1) plugs into the computer
    • The other connector (2) plugs into a power socket
    • And sometimes, a third (3) connector plugs into the supply itself
    Laptop PC power supply with annotated connectors.
  2. Examine all cables and connectors for visible damage. If they are damaged, they may need to be replaced.
  3. Make sure all connectors are firmly plugged in.
All-In-One
  1. An All-In-One desktop PC has an external power supply just like a laptop PC has:
    • One connector (1) plugs into the computer
    • The other connector (2) plugs into a power socket
    • And sometimes, a third (3) connector plugs into the supply itself
    All-In-One Desktop PC power supply with annotated connectors.
  2. Examine all cables and connectors for visible damage. If they are damaged, they may need to be replaced.
  3. Make sure all connectors are firmly plugged in.
Desktop
  1. This type of desktop PC has an internal power supply included in the PC case.
  2. The power cable looks like below. Examine the cable and connectors for visible damage. If you find any damage, the cable may need to be replaced.
    Desktop PC power cable.
  3. Make sure one end of the cable is firmly plugged into a wall outlet.
  4. Make sure the other end is firmly plugged into the power socket on the rear side of the PC case.
    Backside of a desktop PC with power connector highlighted.
  5. Some power supplies have an I/O switch. Ensure this is set to the on position. If the I (1) is pressed in, it means the power supply is turned on. If the O (2) is pressed in, the power supply is turned off.
    Power supply IO switch.

3 Check the Connections Between My Computer and Monitor

With a Windows PC that connects to an external monitor you'll need to check and make sure the monitor is properly connected and powered. A monitor that is disconnected can make it seem like your PC is not turning on.

  1. Examine all cables and connectors for visible damage. If they are damaged, they may need to be replaced.
  2. Make sure one end of the power cable is firmly connected to the back panel of the monitor and the other end into a power socket.
    Monitor being connected to power and video source.
  3. Make sure one end of the video cable is firmly connected to the back panel of the monitor and the other end into video source device, such as a computer, gaming console, media player, etc.
  4. If the monitor has an external power supply, make sure all connectors are firmly plugged in:
    • One connector (1) plugs into the monitor
    • The other connector (2) plugs into a power socket
    • And sometimes, a third (3) connector plugs into the supply itself
    Monitor power supply connectors annotated.
  5. Monitors can be connected to video source devices through a variety of connection types. The most common ones are shown below:
    Video connector types.
  6. Make sure the monitor is powered on and set to the video input source matching the connection type. This varies greatly by brand and model. If you're unsure how to do this please refer to the monitors documentation.

4 Unplug My PC and Do the Power Button Trick

  1. Unplug the computer from the power outlet.
    Power connector being unplugged from outlet.
  2. Press and hold the power button for 10 seconds then release it.
    Power symbol.
  3. Plug the computer back into the power outlet and press the power button to turn it on.

5 If It Still Doesn't Work

Please contact the product manufacturer for further assistance.

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It can be an awful feeling to press the power button on your Windows PC and for it to not turn on. If you don't hear any beeps or a startup chime, you don't hear any fan or drive noise, you don't see any indicator lights turn on and the screen is blank, then your computer may not be getting power. Do not panic! This guide will provide some basic troubleshooting steps that may get your PC up and running in no time.
Computer power button about to be pressed.
  1. Make sure you are using a working power outlet. You can test another electric device, such as a lamp, with the same power outlet. Bypass any power strips for troubleshooting purposes.
    Turned on lamp plugged into power outlet.
  2. Once you made sure the power outlet is working, firmly plug in your device into the working outlet.
    Power cable plugged into power outlet.
  3. If the device has buttons or a remote control, press the power button to turn the device on.
    Power symbol.

There are multiple different Windows systems that have different ways to check for the proper power set up. Click the one that matches the model you have and follow the steps to make sure your PC is properly powered up.

Laptop
  1. A laptop PC has an external power supply and connects like below:
    • One connector (1) plugs into the computer
    • The other connector (2) plugs into a power socket
    • And sometimes, a third (3) connector plugs into the supply itself
    Laptop PC power supply with annotated connectors.
  2. Examine all cables and connectors for visible damage. If they are damaged, they may need to be replaced.
  3. Make sure all connectors are firmly plugged in.
All-In-One
  1. An All-In-One desktop PC has an external power supply just like a laptop PC has:
    • One connector (1) plugs into the computer
    • The other connector (2) plugs into a power socket
    • And sometimes, a third (3) connector plugs into the supply itself
    All-In-One Desktop PC power supply with annotated connectors.
  2. Examine all cables and connectors for visible damage. If they are damaged, they may need to be replaced.
  3. Make sure all connectors are firmly plugged in.
Desktop
  1. This type of desktop PC has an internal power supply included in the PC case.
  2. The power cable looks like below. Examine the cable and connectors for visible damage. If you find any damage, the cable may need to be replaced.
    Desktop PC power cable.
  3. Make sure one end of the cable is firmly plugged into a wall outlet.
  4. Make sure the other end is firmly plugged into the power socket on the rear side of the PC case.
    Backside of a desktop PC with power connector highlighted.
  5. Some power supplies have an I/O switch. Ensure this is set to the on position. If the I (1) is pressed in, it means the power supply is turned on. If the O (2) is pressed in, the power supply is turned off.
    Power supply IO switch.

With a Windows PC that connects to an external monitor you'll need to check and make sure the monitor is properly connected and powered. A monitor that is disconnected can make it seem like your PC is not turning on.

  1. Examine all cables and connectors for visible damage. If they are damaged, they may need to be replaced.
  2. Make sure one end of the power cable is firmly connected to the back panel of the monitor and the other end into a power socket.
    Monitor being connected to power and video source.
  3. Make sure one end of the video cable is firmly connected to the back panel of the monitor and the other end into video source device, such as a computer, gaming console, media player, etc.
  4. If the monitor has an external power supply, make sure all connectors are firmly plugged in:
    • One connector (1) plugs into the monitor
    • The other connector (2) plugs into a power socket
    • And sometimes, a third (3) connector plugs into the supply itself
    Monitor power supply connectors annotated.
  5. Monitors can be connected to video source devices through a variety of connection types. The most common ones are shown below:
    Video connector types.
  6. Make sure the monitor is powered on and set to the video input source matching the connection type. This varies greatly by brand and model. If you're unsure how to do this please refer to the monitors documentation.
  1. Unplug the computer from the power outlet.
    Power connector being unplugged from outlet.
  2. Press and hold the power button for 10 seconds then release it.
    Power symbol.
  3. Plug the computer back into the power outlet and press the power button to turn it on.