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About unexpected restarts

Rarely, your Mac might experience a software or hardware issue that requires it to restart. When it starts up again, you might see a message that your computer was restarted because of a problem.

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Mac

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 might 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 might help:

  • Install all available software updates.
  • If your Mac suspects that a particular app caused the restart, it might ask whether you would like to move the app to the Trash. Click Move to Trash, 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 continues after reinstalling macOS, check your hardware.

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Check your hardware

Learn 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.

  1. Shut down your Mac.
  2. Disconnect all peripheral devices, such as hard drives or printers. If you have a desktop Mac, make sure that only a display, keyboard, and mouse or trackpad are connected.
  3. Turn on your Mac.
  4. Use your Mac for the amount of time that it would usually take for an unexpected restart to occur.
  5. If an unexpected restart occurs, follow the steps to check the internal RAM and third-party hardware.
  6. 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 recently installed memory or a hard disk (or SSD), make sure that it's compatible and installed correctly. If possible, remove it and test with the original memory or disk.

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  • 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. The next time that your Mac restarts unexpectedly, record the date and time it occurs. These questions might 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?
  • Learn what to do if your Mac doesn't turn on or start up.
  • Learn about the screens you see when your Mac starts up.

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Finding the source of an unexpected disconnect is very difficult since so many things can cause it to happen. DHCP time-outs, bad cables, bad routers, bugs in the server, bugs in the client, bad network cards, corrupted data, etc. So one person's problem with unexpected disconnects may be completely different from another persons problem. Also, there is the sheer randomness of the disconnects. That is why you do not see postings from Apple with a single magic answer. That said, here are some ideas to try...
DHCP - in OS 8.5.x
DHCP - in OS 8.5.x, Open Transport changed their DHCP implementation to be closer to the published standards. Apparently this has caused some disconnects to occur when getting close to the renewal times. To determine if this is your problem, try assigning a static IP address to those clients having problems. If the problem only occurs on those Macs with 8.5.x, then this is probably a good place to start.
AppleShare Client 3.8.1
In AppleShare Client 3.8.1 (from OS 8.5.X), I did fix one hanging/disconnecting bug. It is always a good thing to try the latest AppleShare client on those Mac's having problems. As far as I know (no guarantee's here), the AppleShare client should work on most versions of the OS 7.5.x - 8.5.x, without having to upgrade the OS. Some versions of the clients have a gestalt checking for certain versions of Open Transport that we need. Just copy the AppleShare extension to the client CPU and reboot and see if it works. It should.
Software Conflicts
There seem to be conflicts with some virus checkers (don't remember which ones), and some versions of At Ease (donÕt remember which ones). Try disabling them and see if the problems go away. This is pretty standard isolations. Start with a 'clean' system folder and start adding things in until the bug shows up.
EtherPeek Traces
Imagine trying to tell someone over the telephone (or by e-mail) how to assemble a bike while you are reading the instruction manual inside of a dark closet. Trace files of the network packets tell us exactly what is going on and exactly who is disconnecting who. The server can initiate or the client can initiate the disconnect and there is no way to tell the difference without a trace. Etherpeek is very cheap and a MUST HAVE for debugging network problems. You can download a free demo copy from their web site. No, I don't get any endorsement money from AG Group. I don't even get free copies of their software! ;-)
Network cards/hubs - full/half duplex
Full duplex is kind of like the early 33-56K modem implementations. If you had a modem from company A and another modem from company B, they typically did not work well together even though they both say they support standard XXX. Full duplex is still pretty much hit and miss if you mix and match components from different companies. Half duplex Ethernet seems pretty stable and reliable. Give it a try and see what happens. Trying different Ethernet cards/cables also can help you isolate where the disconnects may be occurring. I also have a small utility called Duplexer that allows you to 'force' the Ethernet Duplex on many of Apple's built in Ethernet.