Quit Disk Utility and return to the Utility Menu. Click on the First Aid button in the toolbar. Select the indented (usually, Macintosh HD) volume entry from the side list. Choose Disk Utility and click on the Continue button. Immediately after the chime hold down the Command and Rkeys until the Utility Menu appears.
Repair the disk by booting from the Recovery HD. DOWNGRADE OS MAC SIERRA HOW TO
How to invoke and interpret the Apple hardware tests - CNET.
Use Apple Hardware Test to see if there is any hardware malfunction. Also, see Use safe mode to isolate issues with your Mac - Apple Support and Playing Safe- what does Safe mode do?. Test in safe mode to see if the problem persists, then restart normally. Reset your Startup Disk and Sound preferences. Reset the System Management Controller (SMC). Disconnect all third-party peripherals. Shutdown the computer, wait 30 seconds, restart the computer. You should try each, one at a time, then test to see if the problem is fixed before going on to the next.īe sure to backup your files before proceeding if possible. The following may help to get it working properly:Ī Troubleshooting Procedure that may Fix Problems with macOS El Capitan or Later However, add more RAM if you can or trim down your system. See How to Downgrade macOS High Sierra and macOS Reversion- How to Downgrade from High Sierra. You will need a backup of the older system that you can clone to the startup volume Ī copy of the original installer for the older system that was downloaded from the App Store They work for any version of OS X, namely, you must do an Erase and Install, what some call a Clean Install. Read these links about how to downgrade OS X. 
Memory demands in Sierra are no different than in High Sierra.
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