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Fix a desktop that will not turn on

We'll rule out power cord, outlet, and power supply, then isolate the cause—bad outlet, failed PSU, or motherboard failure—or tell you when to call a pro.

Troubleshooting · Home maintenance
10–25 min
What you'll need
  • Known-good power cord (C13/C14 type)
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Steps

Goal: Rule out power cord and outlet, then isolate PSU or motherboard failure.

  • Confirm the power cord is connected at both ends and the outlet works.
  • Good: Cord and outlet confirmed. Proceed to Check power cord and outlet.
  • Bad: Try a different outlet and power cord.

Check power cord and outlet

Goal: Rule out power cord fault and outlet issues.

  • Reseat the power cord at the PC and wall. Check the wall switch and circuit breaker. Try a known-good power cord.
  • If a different cord works, replace the original. If not, the outlet or PSU may be the issue.
  • Good: Cord and outlet confirmed. Proceed to Power-cycle.
  • Bad: Outlet dead—try another circuit or call an electrician.

Power-cycle

Goal: Reset the power circuit.

  • Unplug the power cord from the back of the PC. Hold the power button for 15 seconds. Plug the cord back in and press power.
  • Good: Desktop powers on. If not, disconnect all peripherals and retry.
  • Bad: PSU or motherboard may have failed—call a technician. If you smell burning, do not use the PC—contact support.

When to get help

Call a technician if:

  • The outlet works with another device but the desktop still shows no sign of life.
  • You smell burning or the PSU makes clicking or buzzing.
  • The power button is stuck or does not respond.

Verification

  • The power LED lights when you press the power button.
  • The fan spins or the desktop boots to the login screen.
  • No damage to the power port and no burning smell.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Power cord and outlet Reseat connections; try different outlet and power cord.
  2. Power-cycle Unplug cord, hold power 15 sec, plug back in.
  3. Power button and peripherals Check power button; disconnect all peripherals and retry.
  4. Call a pro Outlet confirmed good but no sign of life; burning smell; PSU noise.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Desktop model and PSU wattage:
  • Whether a different outlet or power cord works:
  • Power button condition (stuck, loose):
  • Steps already tried:

Is the power cord firmly connected and the outlet working?

Loose connection and bad outlet are common causes.

Reseat the power cord at the PC and wall. Try a different outlet. Check the wall switch and circuit breaker if applicable. Good: cord connected, outlet works—check power button. Bad: outlet or cord faulty—try different outlet and cord.

Yes No

You can change your answer later.

Is the power button working and not stuck?

A stuck or faulty power button prevents boot.

Press the power button firmly for 3–5 seconds. Confirm it depresses and releases. Good: button works—try power-cycle. Bad: button stuck or loose—call a technician.

Yes No

You can change your answer later.

Try a known-good power cord

Use a different power cord (C13/C14). If the desktop powers on, replace the cord. If not, check outlet with another device and try power-cycle.

Done

Power-cycle: unplug, hold power 15 sec, plug back in

Unplug the power cord. Hold the power button 15 seconds. Plug back in and press power. If still no sign of life, disconnect all peripherals and retry, or call a technician.

Done

Call a technician

Outlet confirmed good but no sign of life; power button faulty; burning smell; or PSU clicking or buzzing. PSU or motherboard replacement requires a professional. Do not open the PSU—high voltage inside.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a desktop not turn on?
Loose or faulty power cord, bad outlet, tripped breaker, failed power supply (PSU), stuck power button, or motherboard failure. Check power cord and outlet first, then power-cycle.
Can I fix a desktop that will not turn on myself?
Yes. Reseat the power cord, try a different outlet. Power-cycle by unplugging and holding power 15 seconds. If the desktop still shows no sign of life after ruling out power, a technician may be needed.
When should I call a technician for a desktop that will not turn on?
If the outlet works with another device, or you smell burning, or the power supply makes a clicking or buzzing noise. PSU or motherboard replacement requires a professional.

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