About unexpected restarts
Rarely, your Mac may experience a software or hardware issue that requires it to restart. When it starts up again, you may see a message saying that your computer was restarted because of a problem.
Unexpected restarts are usually caused by software installed on your Mac or by devices connected to your Mac. If the issue causes your Mac to restart every time it attempts to start up, your Mac may eventually shut down. Use the steps below to check the software and hardware on your Mac.
Check your software
If the issue is caused by software on your Mac, one of these steps may help:
- Install all available software updates.
- If your Mac suspects that a particular app caused the restart, it may ask whether you would like to move the app to the Bin. Click Move to Bin, then contact the software developer to see if a software update is available.
- Use safe mode to try to isolate the cause of the issue.
- Reinstall macOS. If the issue persists after reinstalling macOS, check your hardware.
Check your hardware
Find out how to check your connected devices and other hardware.
Check peripheral devices first
If you don't have any devices attached to your Mac, skip to the next section.
- Shut down your Mac.
- Disconnect all peripheral devices, such as hard drives or printers. If you have a desktop Mac, make sure only a display, keyboard, and mouse or trackpad are connected.
- Turn on your Mac.
- Use your Mac for the amount of time that it would usually take for an unexpected restart to occur.
- If an unexpected restart occurs, follow the steps to check the internal RAM and third-party hardware.
- If an unexpected restart doesn't occur, turn off the Mac and connect one peripheral device at a time until an unexpected restart occurs.
Check RAM and third-party hardware
Certain models of Mac computers have removable memory (RAM). If you have recently installed memory or a hard disk (or SSD), make sure it's compatible and installed correctly. If possible, remove it and test with the original memory or disk.
- If you continue to experience unexpected restarts, contact Apple Support.
- If your Mac is frequently restarting unexpectedly, it's important to determine the exact steps that lead up to the issue. Next time your Mac restarts unexpectedly, record the date and time it occurs. These questions may help you diagnose the problem:
- Was the computer starting up, shutting down or performing a particular task when the unexpected restart happened?
- Is the computer restart random or does it happen every time you do a certain task?
- Does the restart happen when a specific external device is connected to your Mac or to a specific port?
- Find out what to do if your Mac doesn't turn on or start up.
- Find out more about the screens you see when your Mac starts up.