After downloading Macos High Sierra my computer started runing slow off and on..now the screen keeps blacking out. Is there anything I can do?
iMac
Hi,
A Safe Mode boot deletes system caches that can help after a macOS upgrade.
To start up in safe mode:
Start or restart your Mac, then immediately press and hold the Shift key. The Apple logo appears on your display. If you don't see the Apple logo, learn what to do.
2. Release the Shift key when you see the login window. If your startup disk is encrypted with FileVault, you might be asked to log in twice: once to unlock the startup disk, and again to log in to the Finder.
To leave safe mode, restart your Mac without pressing any keys during startup.
Use safe mode to isolate issues with your Mac - Apple Support
Hi,
A Safe Mode boot deletes system caches that can help after a macOS upgrade.
To start up in safe mode:
Start or restart your Mac, then immediately press and hold the Shift key. The Apple logo appears on your display. If you don't see the Apple logo, learn what to do.
2. Release the Shift key when you see the login window. If your startup disk is encrypted with FileVault, you might be asked to log in twice: once to unlock the startup disk, and again to log in to the Finder.
To leave safe mode, restart your Mac without pressing any keys during startup.
Use safe mode to isolate issues with your Mac - Apple Support
After downloading the macos High Sierra my computer started running slow and now the screen is blacked out
