Mac Unexpected Shutdown

Posted By admin On 19/01/22

You are working on a Macbook, surfing the web or doing important work. Suddenly, your Mac shut down for no reason. Here is a fix.

How to fix random shutdowns on 13-inch MacBook Pro? Let your MacBook Pro battery discharge until it is under 90% battery percentage. You can check battery percentage by looking in the Mac menubar.

  1. . using known-good Mac same model, did clean install of OS, returnEd to faulty Mac – still crashes on/before start up. Observation - in off chance I got to Recovery Mode, the shut down options window wouldn’t give up. Repeatedly hitting ESC to cancel persistent unsolicited shutdown attempts was only thing to prevent it from turning off.
  2. Step 3: Finding Your Mac's Reboot/Shutdown History (via Terminal) Open up Terminal again, if it's not already, and use the last reboot or last shutdown command. Just type them out one by one, then press return on your keyboard. The former logs every time your Mac was rebooted, obviously, and the latter when exactly it was shutdown.
  3. Mac 911 By Ted Landau, Senior Contributor Oct 7, 2011 3:30 am PDT. This week, an updated Apple support article offers a reminder on what to do if Mac OS X Mail keeps crashing (“unexpectedly.

Typically, a sudden Mac shutdown occurs only once and does not occur again. However, if you work on a computer that shuts off unexpectedly without warning, it could be frustrating or cause you serious problems. Here, will guide you some tips and tools to help fix this error on Mac.

What to do when the Mac is shut down?

When a Mac shuts down randomly, the first and most important step is to reboot it immediately. This is extremely necessary because programs will not close properly during hot shutdown.


To reboot, select Restart from the Apple menu from the top left corner. However, booting a Mac does not solve the problem. In this case, Apple recommends that you reset your computer's System Management Controller (SMC).

SMC is a Mac subsystem with an Intel processor. It controls components like battery charging, video mode switching, computer sleep and wake status, LED indicator lights and more.

Before reinstalling SMC, Apple recommends that you perform the following steps in order:

  1. If the Mac is unresponsive, press and hold the power button until it shuts down. Then press the power button again to turn on the device.
  2. Press Cmd + Option + Esc to force out any unresponsive applications.
  3. Put your Mac to sleep by selecting Sleep in the Apple menu, then waking it up.
  4. Restart your Mac by selecting Restart from the Apple menu.
  5. Turn off your Mac by selecting Shut down from the Apple menu.

How to reset SMC

Once you've done all the steps above, reset the SMC of the Mac. The following instructions vary depending on whether your Macbook has a removable battery or an adapter. Some Macbooks have non-removable batteries, including the MacBook Pro from 2009 onwards, every MacBook Air, MacBook (Late 2009), and 12-inch MacBook from 2015 to present.

In addition, there are a number of separate installation steps for Macbook with Apple T2 security chip. These are usually Macs from 2018 onwards.

If your Mac has non-removable battery

  1. Shut down the Mac.
  2. Plug MagSafe or USB-C power adapter into power source and Mac.
  3. Using the built-in keyboard, press Shift + Control + Option on the left side of the keyboard, press the power button at the same time.
  4. Un-press the keys, then press the power button again to turn on the Mac.

For Macs with a removable battery

  1. Turn off the Mac.
  2. Disconnect from MagSafe power adapter.
  3. Remove the battery.
  4. Press and hold the power button for 5 seconds.
  5. Replace the battery and plug in the MagSafe again.
  6. Press the power button to turn on the Mac.

For iMac, Mac mini or Mac Pro

  1. Shut down the Mac.
  2. Unplug the power cord.
  3. Wait for 15 seconds.
  4. Plug the power cord back in.
  5. Wait for 5 seconds, then press the power button to turn on the device.

For Mac notebooks with T2 chips

  1. Select Shut down from the Apple menu.
  2. After the Mac shuts down, press the Shift key on the right, the Option key on the left and the Control key on the left for 7 seconds.
  3. Then keep pressing and holding those keys while you press the power button for another 7 seconds.
  4. Release all 3 keys and power button, then wait a few seconds.
  5. Press the power button again to turn on the Mac.

Help Mac work well

Macs have a long life, but they can cause problems due to long-term use. Thankfully, you can take some steps so that it continues to run smoothly.

Monitor Mac battery

The computer's rechargeable battery does not have a permanent lifespan. Each battery operates only with a certain charge cycle. When the battery is too old and gets stuck, you need to replace it.

Users can count the current charging cycle of the Mac by going to the Apple menu, selecting About This Mac . Select System Report then navigate to the Power section under Hardware , in the Battery information section, you will see the number of current charging cycles (Cycle Count).

Each Mac has a different maximum charging cycle. Some early Macs only have a charge cycle count of 300, while most newer models have a longer charging cycle, up to 1000. A battery charge cycle means you're running out of power. battery, not necessarily a single charge. For example, if you discharge the battery from 100% to 50%, then charge it to 100% and then discharge to 50%, it will be counted as 1 cycle.

When the battery has reached its maximum charging cycle, it is time for it to be replaced.

Use 3rd party tools

When Macs crash, there are plenty of free 3rd-party tools for Macs that fix the problem.

One of the best options if you want to know more about your Mac's battery is the Battery Health software . This app provides a lot of information about your Mac's battery rather than just charging cycles, and explains the information in less technical terms so you can monitor battery temperature and status. , design performance and more. This application will also help users know their battery can be used for how long at the current charge when performing various activities on the machine.

Checking your battery temperature is also important. If the battery regularly overheats, it may be having bigger problems.

Read the Logs


The less you charge, the longer it will last and the better it will be for the computer. Therefore, applications that consume a lot of battery will have a lasting impact on your device.

The easiest way to see which apps are using the most battery on a Macbook is to select the battery icon on the menu bar in the upper right corner of the screen. Here, you will see applications that consume a significant amount of battery (in the Using Significant Energy section).

Users should also use the Mac's Activity Monitor, which shows you which apps and programs are using the most CPU. Go to Applications> Utilities> Activity Monitor to open it. Pay attention to the entries in the CPU and Energy tabs , as a lot of software takes up a lot of CPUs which can cause you problems.

Save energy

You should also check your computer's Energy Saver settings in the System Preferences menu section . For most users, the default settings are appropriate. Click Restore Defaults for those settings.

Calibrate battery for Macbook

You should calibrate batteries for old Macs once a month. According to Apple, any Macbook model manufactured from the second half of 2009 to now is pre-calibrated and does not require users to adjust.

Properly calibrating your Macbook battery is the best way to monitor the amount of power your computer has left and can work before it shuts down. If the battery is not properly calibrated, it may be shut down or sleep without warning. Once calibrated, you will have a better understanding of the remaining battery power on your device.

If Macbook still shut down suddenly?

If your Mac continues to shut down suddenly and, after doing all of the above-mentioned troubleshooting solutions, take it to an Apple store or a trusted computer repair center for help. support.

If the cause of the device being accidentally shutting down is due to the battery, try the above before deciding to replace the battery.

If you want to protect your Mac better, you can refer to the article: Summary of necessary ways to protect Macs should not be ignored

Does your MacBook randomly shut down? It's timing always seems to be so 'perfect,' just as you're about to jump on that important Zoom call, send an email, or finish the last paragraph of your thesis. For many Mac users, this annoying experience happens regularly, like every few days. In this article, we'll explain why your Mac keeps shutting down and tell you how to fix it.

Why does your Mac shut down all of a sudden?

It is challenging to locate and identify the exact issue that might cause your Mac to randomly shut down.

Here are some known reasons:

  • Software errors

  • The old version of macOS

  • Malware

  • Peripheral devices cause malfunctions

The best advice is to go through all the possible fixes, one by one, to try and find the cause and solution. Let's get to it.

Did you know? In 2019, Apple officially recognized the issue and updated a support article, which helps troubleshoot the issue on MacBook Pro (13-inch, 2019, Two Thunderbolt 3 ports). We'll talk more about this later in the article.

How to stop your MacBook from shutting down automatically

1. Complete a proper shutdown

This has to be number 1 on the list, no matter how obvious and a bit ridiculous it sounds.

An unexpected shutdown is not quite the same as a proper one. Correctly shutting down your Mac from the Apple menu allows all the background processes and programs to close safely– reducing other risks of issues.

After an unexpected, random shutdown:

  1. Power up your Mac once again.

  2. Press Command-Option-Esc to Force Quit any applications that are not responding.

  3. Then, go to the Apple menu, put your Mac to sleep, and restart your Mac.

This is unlikely to entirely fix the problem, but it's basic troubleshooting and a good starting point.

2. Check your Mac for malware

Malware is capable of wreaking havoc on your Mac and could be responsible for your Mac shutting down on its own. I use the CleanMyMac X Malware Removal module to run regular checks on my Mac.

I like CleanMyMac X because it protects my Mac from all kinds of vulnerabilities in real-time and warns me whenever I'm downloading something suspicious.

You can download a free version here. The app is notarized by Apple, so you know it's safe to use.

  1. Open the CleanMyMac X app.

  2. In the left sidebar, select Malware Removal.

  3. Press Scan and wait for it to complete.

If anything is found, CleanMyMac X will remove it for you.

3. Reset your SMC settings

The SMC (System Management Controller) is a chip that controls components like battery, fans, power and other features. Resetting SMC may help you fix random shutdowns.

The steps can be slightly different depending on if your Mac has a removable battery or not.

MacBooks that have a non-removable battery:

  • Any MacBook Pro from 2009 and later

  • Every MacBook Air, MacBook (Late 2009)

  • 12-inch MacBook from 2015 and later

If your Mac has a non-removable battery, here's how to reset the SMC:

  1. Shut down your Mac.

  2. On your built-in keyboard (not a removable one), press Shift-Control-Option on the left-hand side of your keyboard while the power button pressed at the same time.

  3. Hold all four keys for 10 seconds and then release.

  4. Push the power button again to start your Mac.

If your battery is removable, here's how to reset the SMC:

  1. Shut down your Mac, and disconnect the power adapter.

  2. Remove your battery, and press and hold the power button for five seconds.

  3. Now, reconnect the battery and power adapter.

  4. Press the power button and turn your Mac back on.

For any Macbook with the T2 chip (almost all Macs introduced in 2018 or later), here's how to reset the SMC:

  1. Shut down your Mac.

  2. Once shut down, press and hold the Shift key on the right, the Option key on the left, and the Control key on the left for 7 seconds; while keeping those buttons pressed, now hold down the power button for 7 seconds more.

  3. Now, release all keys and wait a few moments.

  4. Turn your Mac on as usual.

Not sure if you've got a T2 Chip? Here's how to do a quick check.

  1. Holding down the Option key, select the Apple icon, top left.

  2. Click System Information and click Controller.

  3. If you have T2 Chip, it will be listed here (As you can see, mine Mac has it).

4. Monitor your battery health

Batteries don't last forever; each battery is supposed to last for a limited number of charge cycles, and this varies by model. A depleted battery could be the cause of your Mac randomly shutting down. It's pretty simple to check your battery status, and if you've reached your maximum cycle count, well, it's time for a new one.

Mac Unexpected Shutdown Version

Check your battery:

  1. Open the Apple icon, top left, and select About This Mac.

  2. Click System Report; under the Hardware section, select Power.

  3. Under Battery Information, you'll find your current cycle count.

If your battery is reaching 1000 cycles, it’s time to replace it. Under Cycle Count, you’ll see Condition, and when it’s Normal, your battery is fine.

5. Update your macOS

When your Mac is up-to-date, there is, of course, less chance of shutdowns, so it's another obvious one, but check for updates; this gives your Mac another fighting chance.

  1. Open the Apple menu.

  2. Select, About This Mac and Software Update.

  3. If you've got one pending, like me, you'll see it listed there.

While we're talking basic checks, running some simple maintenance scripts and repairing disk permissions is another way you can help if your Mac randomly shuts down.

The app I mentioned earlier, CleanMyMac X, has a really simple to use Maintenance Module, which can run these checks in just a few clicks.

  1. Download CleanMyMac X here.

  2. Open the CleanMyMac X app.

  3. From the left side, bar select Maintenance.

  4. Then select Run Maintenance Scripts, and Repair Disk Permissions from the list then hit Run.


If the issue persists

Earlier on, I mentioned that Apple acknowledged the random crashing issue in 2019. They have a quick support article, which tells you what to do when your MacBook shuts down.

Although Apple says this is just for 13-inch, 2019, Two Thunderbolt 3 ports MacBook Pros, there are lots of discussions online where other Mac devices users have had success with this – I think it's worth a try. You can read the official support article here.

Mac Shut Down Unexpectedly Won't Turn On

So, there we have it; we've looked at some great ways to help when your MacBook Pro keeps shutting down. Happy troubleshooting, and come back for more articles and guides.