Recycling Frenzy Mac OS

About unexpected restarts

Recycling Frenzy Mac Os X
Recycling Frenzy Mac Os 11
Mac Os Mojave
Recycling Frenzy Mac Os 11
Recycling Frenzy Mac Os Catalina

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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.

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.

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.

Shut down your Mac.
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.
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 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.

Learn more

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.

Updated December 2, 2020: added information for new Macs with Apple processors.

All too often I’ve seen people buy a used Mac only to find that the seller did not properly erase the Mac first. Sellers sometimes just delete their documents, leaving poorly configured and obsolete apps lying around. Or worse yet a malicious security threat or connections to their old account. Here is how to properly erase a Macintosh, ensuring that:

If you are selling or recycling your Mac, none of your personal information remains
If you are buying a used Mac, none of the previous owner’s configuration will mess things up

Take note of what system version you are running, as some of these instructions will vary depending on the version. You can find that in the Apple menu > About This Mac.

Back up any data

These steps will completely and irrecoverably erase everything on your Mac. If you have anything on this Mac that you want to keep you’ll want to back it up. Photos, contacts, documents, application installers, etc. Many of these things are saved to iCloud but not necessarily. When we are done the only thing left will be a squeaky clean computer as good as from the factory.

Update your software (optional)

If the computer is going to be reused or sold, you probably want to upgrade the software to the latest supported OS if it isn’t already. It’s better to do an upgrade and then erase rather than an erase and then upgrade. If you’re planning to simply recycle the computer it doesn’t matter so you can skip this.

You can view my reference chart to see what version of macOS you can run, and where to get each version.

Log out of your accounts

This isn’t strictly necessary but it will remove one of your five allowed iTunes authorizations and will remove the computer from your iCloud account. In particular, you’ll want to:

Deauthorize iTunes. Instructions are the same for the Music app in macOS Catalina. You only need to do it for Music or Apple TV, not both.
Log out of iCloud (in the Apple menu > System Preferences > iCloud), if prompted you can delete the local data, since you have all of this in iCloud already.
Log out of iMessage (open iMessage, click the iMessage menu, click the Accounts tab, click the iMessage account on the left column, and then click the button to sign out)
Log out of FaceTime (similar to logging out of iMessage).
Deactivate any third party software that has a limited number of authorizations. Most consumer-grade software doesn’t do this, but some expensive professional software does. Instructions for this will vary depending on the specific software.

Start up in macOS Recovery Mode

Be sure to remove all devices from your computer except for necessary items like the mouse and keyboard. You don’t want to accidentally erase an external hard drive.

For macOS 11 or higher with an Apple processor

Turn your computer off
Press and hold the power button until you see icons
Click the Options icon then click Continue

For macOS 10.7 or higher with an Intel processor

Turn your Mac off
Press the power button to turn the Mac back on and immediately press and hold the Command + R keys on your keyboard
When you see the Apple logo or globe you can release the keys
Follow any prompts such as entering your WiFi password or choosing your language

Shortcut: If you are running macOS 10.13 High Sierra or later and you want to install the latest OS your computer supports rather than the currently installed OS, use Command + Option + R instead. You can release the keys when you see the globe, then choose your WiFi network when prompted.

For Mac OS X 10.6 and lower

You’ll need to boot using a Mac OS X disc. If you don’t have your disc you may need to upgrade the system software to a newer version first and then try again. Or you’ll need to enter Target Disk Mode and connect it to another Mac to erase with Disk Utility.

With the computer powered on, insert your Mac OS X install disc or the recovery disc that came with your Mac
Turn off your Mac
Press the power button to turn the Mac back on and immediately press and hold the Option key on your keyboard
Release the Option key when you see the boot selector
Use your arrow keys on your keyboard or your mouse to select the install disc (it could take up to a minute to appear)
click the arrow below the install disc or press Return on your keyboard to activate it

Erase your disk

For Macs with an Apple Processor

Use the WiFi icon in the upper right corner of your screen to connect to WiFi if you are not already
Click the “Utility” menu on the top of the screen and choose “Terminal”
In the terminal window type resetpassword and then press return
Click on the new window that pops up
Click the Recovery Assistant menu
Click “Erase Mac…” and follow the prompts to erase your Mac

For Macs with an Intel Processor

Once in Recovery Mode, click the Disk Utility from the menu and then click “Continue”
If running macOS 10.15 Catalina or 11 Big Sur you will see two similarly named drives on the left column, one with “Data” on the end. Click the Data drive to highlight it, then click the Minus Volume button above to remove the volume. Choose “Delete” (not Delete Volume Group). If you aren’t running Catalina or if you only see one internal drive skip this step.
Click to highlight your hard drive name on the left column, Macintosh HD by default. If you are running macOS 10.12 or lower it will be indented slightly behind the model name of the hard drive.
Click the Erase button. Depending on your OS version this will either be on the top button bar or on a tab to the right.
If you want to destroy sensitive data, click the “Security Options” button and choose the level you want to run. Each pass takes about two hours depending on the speed of your drive. A single pass is good enough for most people. But consider more if you have any highly sensitive data. If you have an SSD or Fusion Drive you may not have this button because a standard erase is far more destructive.
If the Format is listed as APFS, leave it as is. Otherwise make sure it says “MacOS Extended (Journaled)”.
Click Erase and wait for it to complete. Erasing an SSD or an insecure erase takes just a few seconds. A secure hard drive erase can take hours. If it fails pretty much immediately just try again. Sometimes it takes a couple of tries. If it runs for a long time and then fails, you may have a bad hard drive.
Click OK after it has finished.
Close Disk Utility with the red dot button.
Press Command-Q to shut down if you are just disposing of the computer, otherwise continue on to install the OS.

Install the OS (Optional)

If you are only recycling the computer and don’t need to prepare it for another user you can skip this step and shut down your computer by pressing Command-Q.