PC Shutdown Randomly

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Your computer shut down because of a problem

This page covers the Mac startup notice after an unexpected shutdown or crash. It is not a Windows Event Viewer guide.

First cut On a Windows PC that dies without this Mac wording, use the home decision tree, shuts down and restarts, or overheating — do not force Mac steps onto Windows. If macOS never finishes starting and loops into another crash, keep going through Safe Mode and diagnostics below.

Step 1 — Confirm the Mac message

After power-on you see a dialog that your computer shut down or restarted because of a problem. Apple treats unexpected restarts as usually software- or accessory-related, with hardware checks if those fail.

Simplified Mac login-area dialog reading Your computer shut down because of a problem with a red box around the message text
The intent of this URL is that macOS dialog — not a generic PC blackout.

Step 2 — Install available software updates

Apple’s first software check is to install all available updates (macOS and apps). Many unexpected restart reports clear after a system update.

  1. Open System Settings → General → Software Update (wording varies slightly by macOS version).
  2. Install pending updates and restart when asked.
  3. Retest for the same amount of time it usually took to crash.

Step 3 — Isolate a suspected app

If macOS asks to move a particular app to the Trash after the crash, follow that prompt, then check the developer for an update. Third-party kernel extensions and unstable apps are common crash sources.

Moving the app is a diagnostic step, not a permanent ban — reinstall a fixed build from the vendor when available.

Step 4 — Start in Safe Mode

Safe Mode loads a minimal set of extensions and can stop the crash loop long enough to update or remove bad software. Use Apple’s Safe Mode steps for Intel vs Apple silicon Macs (startup key sequences differ).

Stable in Safe Mode Likely login item, extension, or third-party software — remove recent additions, then retest normally.
Still crashes in Safe Mode Continue to peripherals and Apple Diagnostics.

Step 5 — Disconnect peripherals

Per Apple hardware checks:

  1. Shut down the Mac.
  2. Unplug everything except display, keyboard, and mouse/trackpad on a desktop; on a laptop, disconnect docks, hubs, and external drives.
  3. Power on and use it for the usual time-to-failure window.

If the issue stops, reconnect one device at a time until the crash returns — that device (or its cable/dock) is the suspect.

Step 6 — Run Apple Diagnostics

If disconnecting devices does not help, run Apple Diagnostics with peripherals still disconnected. Record any reference codes and follow Apple’s next steps for that code.

Still unstable after diagnostics pass Apple’s software path includes reinstalling macOS when updates and Safe Mode isolation are not enough. Prefer Apple’s reinstall documentation for your chip generation.

Branches

Windows PC random power-off Home · Overheating · PSU · Restarts
Mac won’t finish shutting down Different intent — see computer won’t shut down only if that matches; otherwise stay on Apple’s shutdown/restart docs.
Screen goes dark but Mac stays on Not this message — closer to display path issues (see monitor turns off for PC monitors; on Mac use Apple display troubleshooting).

Symptom map

FAQ

What should I do when my Mac says it restarted because of a problem?

Update software, remove a flagged app if offered, try Safe Mode, disconnect accessories, then run Apple Diagnostics — that is Apple’s published order.

Why does it say I shut down because of a problem after I held the power button?

A forced power-off looks like an unexpected shutdown to macOS, so the notice can appear on the next boot even when you intended to force quit a freeze.

Is this the same as a Windows “unexpected shutdown”?

No. The search results for this exact phrase are Mac-centric. Windows unexpected restarts belong on the home tree and restart pages, with Microsoft’s unexpected restart guidance.

How do I fix a kernel panic on my Mac?

Treat it like Apple’s unexpected restart path: updates, Safe Mode, strip peripherals, diagnostics. Panic logs can name a kext or app after you are stable enough to check Console.

Official / primary sources

  1. Apple — If your Mac restarted because of a problem
  2. Microsoft — Unexpected restarts and stop codes (Windows contrast only)

Independent DIY troubleshooting. We do not sell one-click fix tools. Prefer Apple Support for model-specific startup key sequences.