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Fix a Mac that will not turn on

We'll rule out power adapter, outlet, and SMC, then isolate the cause—adapter fault, SMC reset, or hardware failure—or tell you when to call a pro.

Troubleshooting · Home maintenance
10–25 min
What you'll need
  • Known-good power adapter (compatible with your Mac)
Step 1 of 5

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Steps

Goal: Rule out adapter and outlet, then isolate SMC or hardware failure.

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

Check adapter and outlet

Goal: Rule out adapter fault and outlet issues.

  • Reseat the adapter. Inspect the charging port for debris and damage. Try a known-good adapter.
  • If a different adapter works, replace the original. If not, the SMC may be stuck—proceed to Reset SMC.
  • Good: Adapter and port confirmed. Proceed to Reset SMC.
  • Bad: Port damaged or loose—call a technician.

Reset SMC

Goal: Reset the System Management Controller.

  • Apple Silicon: shut down, unplug 30 seconds, plug back in, wait a few seconds, press power.
  • Intel/T2: shut down, unplug 15 seconds, plug back in, wait 5 seconds, press power.
  • Good: Mac powers on. If not, disconnect peripherals and retry.
  • Bad: Logic board may have failed—call a technician. If the battery is swollen, do not use the Mac—contact support.

When to get help

Call a technician if:

  • The charging port is damaged, loose, or sparking.
  • The battery is swollen—do not use; fire hazard.
  • A known-good adapter and SMC reset do not produce any sign of life (no LED, chime, or display).

Verification

  • The power LED or display lights when you press the power button.
  • The Mac chimes or boots to the login screen.
  • No damage to the port or swelling of the battery.

Escalation ladder

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

  1. Adapter and outlet Reseat connections; try different outlet and adapter.
  2. SMC reset Unplug power 15–30 sec, plug back in, press power.
  3. NVRAM and peripherals Reset NVRAM (Intel only); disconnect all peripherals.
  4. Call a pro Port damaged, battery swollen, or adapter confirmed good but no sign of life.

What to capture if you need help

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

  • Mac model and adapter type:
  • Whether a different adapter works:
  • Port condition (loose, damaged):
  • Steps already tried:

Is the power adapter firmly connected and the outlet working?

Loose connection and bad outlet are common causes.

Reseat the adapter at Mac and wall. Try a different outlet. Check adapter LED if present (green or amber). Good: adapter connected, outlet works—reset SMC. Bad: adapter or outlet faulty—try different adapter.

Yes No

You can change your answer later.

Try a known-good adapter

Use a compatible adapter (same wattage for USB-C, MagSafe for older Macs). If the Mac powers on, replace the adapter. If not, reset SMC and retry.

Done

Reset SMC

SMC controls power and can get stuck.

Unplug power 15–30 seconds (30 for Apple Silicon). Plug back in. Wait a few seconds. Press power. If still no sign of life, disconnect peripherals and retry, or call a technician.

Yes No

You can change your answer later.

Done

Mac powered on.

Done

Call a technician

Port damaged, battery swollen, or adapter confirmed good but no sign of life. Logic board or power circuit failure may need repair. Do not use a swollen battery—it can be a fire hazard.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a Mac not turn on?
Loose or faulty power adapter, bad outlet, stuck SMC (System Management Controller), or hardware failure. Check adapter and outlet first, then reset SMC.
Can I fix a Mac that will not turn on myself?
Yes. Reseat the power adapter, try a different outlet. Reset SMC (unplug 15 sec, plug back). Reset NVRAM if it powers on but has display issues. If still no sign of life, a technician may be needed.
When should I call a technician for a Mac that will not turn on?
If the adapter and outlet work with another Mac, or you smell burning, or the Mac shows no response after SMC and NVRAM reset. Logic board or power circuit failure requires a professional.

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