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A Troubleshooting Procedure that may Fix Problems with macOS El Capitan or Later

You should try each, one at a time, then test to see if the problem is fixed before going on to the next.

Apr 16, 2016 Go to the Finder in Mac OS X and navigate to the /Applications/ folder Locate the game (s) you want to improve the performance of by reducing resolution, then hit Command + i to open Get Info for the game app (altnernatively, go to the File menu and choose “Get Info” when the app is selected). Mar 24, 2018 Set the Format type to APFS (for SSDs only) or Mac OS Extended (Journaled.) Click on the Applybutton, then wait for the Donebutton to activate and click on it. Quit Disk Utility and return to the Utility Menu. Select Reinstall OS X and click on the Continuebutton.

One cannot downgrade a new Mac to a older version of the OS X operating system to work with hardware/software like one can do with a Windows PC and certain 'Pro' versions or better. Apple is Evil, pure and simple. The head of Apple Product Security is a top NSA guy named David Rice. Create even more powerful Mac versions of your iPad apps. Apps built with Mac Catalyst now take on the new look of macOS Big Sur and help you better define the look and behavior of your apps. You can choose to turn off automatic scaling of iPad controls and layout, allowing you to precisely place every pixel on the screen.


Be sure to backup your files before proceeding if possible.


  1. Shutdown the computer, wait 30 seconds, restart the computer.
  2. Disconnect all third-party peripherals.
  3. Reset your Startup Disk and Sound preferences.
  4. Start the computer in Safe Mode. Test in safe mode to see if the problem persists, then restart normally.
  5. Use Apple Hardware Test to see if there is any hardware malfunction.
  6. Repair the disk by booting from the Recovery HD. Immediately after the chime hold down the Command and Rkeys until the Utility Menu appears. Choose Disk Utility and click on the Continue button. Select the indented (usually, Macintosh HD) volume entry from the side list. Click on the First Aid button in the toolbar. Wait for the Done button to appear. Quit Disk Utility and return to the Utility Menu. Restart the computer from the Apple Menu.
  7. Repair permissions on the Home folder: Resolve issues caused by changing the permissions of items in your home folder.
  8. Create a New User Account Open Users & Groups preferences. Click on the lock icon and enter your Admin password when prompted. On the left under Current User click on the Add [+] button under Login Options. Setup a new Admin user account. Upon completion log out of your current account then log into the new account. If your problems cease, then consider switching to the new account and transferring your files to it - Transferring files from one User Account to another.
  9. Download and install the OS X El Capitan 10.11.6 Combo Update or 10.12.6 Combo Update or Download macOS High Sierra 10.13.3 Combo Update as needed.
  10. Reinstall OS X by booting from the Recovery HD using the Command and R keys. When the Utility Menu appears select Reinstall OS X then click on the Continue button.
  11. Erase and Install OS X Restart the computer. Immediately after the chime hold down the CommandandRkeys until the Apple logo appears. When the Utility Menu appears:
  1. Select Disk Utility from the Utility Menu and click on Continue button.
  2. When Disk Utility loads select the drive (out-dented entry) from the Device list.
  3. Click on the Erase icon in Disk Utility's toolbar. A panel will drop down.
  4. Set the Format type to APFS (for SSDs only) or Mac OS Extended (Journaled.)
  5. Click on the Apply button, then wait for the Done button to activate and click on it.
  6. Quit Disk Utility and return to the Utility Menu.
  7. Select Reinstall OS X and click on the Continue button.

If none of the above helps then make an appointment at the Apple Genius Bar for service. If you need to find an Apple Store - Find a Store - Apple.

Ways to help make a slow Mac faster


  1. Visit The XLab FAQs and read the FAQ on Performance
  2. Avoid using any third-party cleanup software. Usually, this software does more bad than good. You don't need it. All computers become slower over time even under normal use. Experienced users erase the hard drive and do a clean install from scratch from time to time; or whenever installing a major OS upgrade. Doing so means you must maintain regular and multiple backups.
  3. If you have enabled iCloud Disk and are storing your Documents and Data in iCloud, then consider turning that off and signing out of iCloud. It can slow down the computer considerably. Please see the following from the user, fotomac: 'The solution was to SIGN OUT of iCloud and my problem STOPPED! NO MORE SPINNING BEACHBALL! My computer's speed increased to what it should be and all my Apps now work!'
  4. Add more RAM or cut back on the number of concurrently running applications and utilities. Remove unnecessary anti-malware software and any software that promises to clean your Mac. Check for runaway processes: Runaway applications can shorten battery runtime, affect performance, and increase heat and fan activity. Also, visit The XLab FAQs and read the FAQ on dealing with The Spinning Beach Ball of Death.
  5. The Ultimate Fix: Backup everything, erase the drive, reinstall OS X, and restore your data from the backup. Reinstall third-party software from original media/scratch.

Mar 24, 2018 12:30 PM

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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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

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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.

  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

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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.