If your Mac reboots unexpectedly (a message appears after rebooting), this is usually a kernel panic error. In this article, we will look at the main causes of an unexpected restart and show you how to fix the problem.
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The most common cause of this problem is software. Damaged or incompatible hardware, including external devices connected to the computer, can also cause the kernel to malfunction.
1. If the kernel panic (unexpected restart) error began to appear after the recent installation of a new application, then try moving it to the Trash (details).
2. Reboot your Mac in Safe Mode, which makes troubleshooting macOS easier. In Safe Mode, non-macOS disables startup applications, and also checks the boot disk. Loading in Safe Mode takes a little longer than usual.
To boot your Mac in Safe Mode, shut down your computer. Turn on your Mac, then immediately press and hold the button ⇧Shift on keyboard. When the gray Apple logo and boot progress bar appear on the screen, release ⇧Shift… Menu bar text Booting in Safe Mode the macOS welcome screen will indicate a successful boot.
Booting into Safe Mode go open the app App Store and install any available updates.
3. Try to remove any additional third party software and plugins. Pay attention to the latest installed updates. It is likely that this was the reason for the incompatibility of modules or plugins that worked fine before.
4. Disconnect all devices connected to the computer via USB and FireWire ports, leaving only the keyboard and mouse. Try uninstalling software updates for third-party hardware, such as PCI cards. Restart your computer. If the problem is resolved, try reconnecting the disconnected devices one at a time and restarting the computer again. This will help you identify which device is causing the problem.
5. Reset the parametric random access memory (PRAM) settings. To do this: Turn off your computer. Turn on your Mac and immediately press and hold the keys ⌘Cmd + ⌥Option (Alt) + P + R… Continue holding them until you restart your computer. Once the Mac boots up again and you see the Apple logo on the screen, release the buttons.
6. Run the Mac Problem Diagnostic Tool (details). Using the app, you can find out information about the installed hardware (for example, about an additional memory module) that is incompatible, incorrectly installed or defective.
7. Use a standard macOS application Disk Utility to restore the boot disk or disk permissions.
8. In case the above methods did not help to fix the problems, try reinstalling macOS (details).