macOS Kernel Panic — Your Mac Restarted Because of a Problem Fix

What Does This Error Mean?

A kernel panic is macOS crashing at its deepest level — the core of the operating system. Your Mac restarts and shows a gray screen with the message 'Your computer restarted because of a problem.' Common causes include faulty RAM, a bad hardware component, or a corrupt system extension.

Affected Models

MacBook Air
MacBook Pro
iMac
Mac Mini
Mac Pro
Mac Studio

Common Causes

Faulty or failing RAM (memory) sticks inside your Mac
A third-party app or system extension with a software bug
External hardware like a USB hub or drive causing a conflict
Overheating — the Mac's processor getting too hot
A failing internal hard drive or SSD corrupting system data

How to Fix It

Disconnect all external devices. Unplug every USB device, hub, external drive, and monitor except power. Restart your Mac and see if the panics stop.

A bad USB device or cable is a surprisingly common cause of kernel panics. Remove everything and add devices back one by one.
Check which app is causing it. After a panic, go to Apple menu > About This Mac > System Report. Under Software, click Logs and look for 'panic' entries to see which app or extension is named.

The panic log names the file that caused the crash. If it points to a third-party app, try uninstalling that app.
Run Apple Diagnostics. Shut down your Mac, then hold the D key and press Power. Follow the on-screen instructions to test hardware.

On Apple Silicon Macs (M1/M2/M3), hold the power button at startup to see the startup options, then follow the diagnostics prompt.
Reset NVRAM. Shut down your Mac. Turn it on and immediately hold Option + Command + P + R for about 20 seconds, until you hear the startup chime twice.

NVRAM stores settings like screen resolution and startup disk. Corrupted NVRAM can cause unexpected crashes.
Reinstall macOS. Open System Settings > General > Transfer or Reset > Erase All Content and Settings. Or boot into Recovery Mode (hold Command + R at startup) and use Reinstall macOS.

This is a last resort for software-caused panics. Back up with Time Machine first.

When to Call a Professional

If kernel panics happen several times a day and none of the fixes help, your Mac likely has a hardware problem. An Apple Store or Apple Authorized Service Provider can run deep diagnostics. Faulty RAM or a failing SSD is the most common hardware culprit.

Frequently Asked Questions

Is a kernel panic the same as a Windows blue screen?

Yes — they are basically the same thing. Both mean the operating system hit a fatal error and had to restart to protect itself. The main difference is macOS shows a gray or black screen instead of a blue one.

Will I lose my files if my Mac has a kernel panic?

Usually not. macOS recovers cleanly and your files should be fine. However, any unsaved work in open documents at the moment of the crash will be lost. If panics happen frequently, back up immediately with Time Machine.

How do I find out what caused the kernel panic?

Go to Apple menu > About This Mac > System Report. Under the Software section, click Logs. Look for entries labeled 'panic' — they include the date, time, and the software or hardware component that triggered the crash.