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Fix when Computer Won’t Turn On

Difficulty: Intermediate
Priority: High

Table of Contents

Summary

Your computer does not power on when you press the power button. There are no signs of life, or it may display lights or fan activity without showing anything on the screen. This issue can be caused by power problems, faulty hardware, loose connections, or software corruption.

Possible causes

  • Loose or unplugged power cable.
  • Faulty wall socket or power strip.
  • Dead laptop battery.
  • Faulty power adapter.
  • Failed power supply unit (PSU).
  • Faulty RAM.
  • Loose internal hardware connections.
  • Defective motherboard.
  • Faulty graphics card.
  • Corrupted BIOS or firmware.

Solutions

Check the Power Source

  1. Ensure the power cable is securely connected.
  2. Plug the computer directly into a working wall outlet.
  3. Test the outlet with another device.
  4. If using a power strip, ensure it is switched on.

Perform a Power Reset

Desktop

  1. Turn off the computer.
  2. Disconnect the power cable.
  3. Hold the power button for 30 seconds.
  4. Reconnect the cable.
  5. Try turning it on.

 

Laptop

    1. Disconnect the charger.
    2. Remove the battery if it is removable.
    3. Hold the power button for 30 seconds.
    4. Reconnect the charger.
    5. Power on the laptop.

Check the Monitor

Sometimes the computer is running, but the display is not working.

Steps

  1. Ensure the monitor is powered on.
  2. Check the HDMI or DisplayPort cable.
  3. Try another cable.
  4. Test another monitor if available.
  5. Select the correct input source on the monitor.

Disconnect External Devices

Faulty USB devices can prevent startup.

Steps

  1. Disconnect all USB devices.
  2. Remove printers, webcams, external drives, and USB hubs.
  3. Leave only the keyboard, mouse, monitor, and power cable connected.
  4. Try powering on again.

Check RAM

Improperly seated memory modules often prevent computers from booting.

Steps

  1. Turn off the computer.
  2. Disconnect power.
  3. Open the computer case.
  4. Remove the RAM sticks.
  5. Clean the contacts gently if necessary.
  6. Reinstall one RAM stick.
  7. Try booting.

Listen for Beep Codes

If your motherboard emits beep sounds during startup:

  • One short beep usually indicates successful startup.
  • Multiple beeps often indicate RAM or hardware issues.

Refer to your computer or motherboard manufacturer's documentation for the meaning of specific beep patterns.

Check the Power Supply (Desktop)

If nothing happens at all:

  • Verify the PSU switch is set to ON (I).
  • Confirm the power cable is firmly connected.
  • If available, test with another compatible power supply.

Remove Recently Installed Hardware

If the issue started after installing new hardware:

  1. Remove the newly installed component.
  2. Reconnect the original hardware.
  3. Attempt to start the computer again.

Boot into Recovery (If the Computer Powers On but Doesn't Load Windows)

  1. Turn the computer on.
  2. Interrupt startup three times to trigger Windows Recovery.
  3. Choose Troubleshoot.
  4. Select Startup Repair.

Requirements

  • Working power outlet
  • Power cable or charger
  • Screwdriver (for desktops)
  • Administrator access (if Windows starts)
  • Basic hardware knowledge for internal checks

Warning

  • Always disconnect power before opening the computer.
  • Avoid touching internal components without grounding yourself to prevent static electricity damage.
  • Never open a power supply unit, as it contains dangerous high-voltage components.