If they are, you won’t be able to download a new copy of the update and macOS will always revert to the old update files. But if the installation was not successful, then it is possible that the update files are still on your computer. MacOS update files delete themselves automatically after being installed.
#Safe mode for mac os sierra install
Wait for the second startup sound before releasing all the keys, then boot as normal.Īfter resetting SMC and NVRAM, check if you can download and install the High Sierra update without going into the black screen. Shut down your Mac once again, then turn it on while pressing Command + Option + P + R on your keyboard after you hear the startup sound. While you’re at it, you might also want to reset your Mac’s system settings, which is very easy to do. When you see the light on your MagSafe adapter blink with a different color, that means that the SMC has been reset. To reset SMC, shut down your Mac, then hold down Shift + Control + Option, then press Power at the same time. SMC manages the video and external displays of macOS, so resetting it should be one of the first steps you should take. Release the Shift button once you see the Apple logo and the progress bar.Īfter booting into Safe Mode, the next step is to reset the System Management Controller or SMC.Hold the Shift button, then press Power to turn it back on.To boot into Safe Mode, follow these steps: This makes sure that no third-party processes will get in the way of the installation. The first step in fixing update errors is to boot into Safe Mode. If you encounter problems such as a black screen after the High Sierra update, you can follow the troubleshooting guides below to restore your display and fix the update error. To avoid hiccups, make sure to get rid of junk files on your Mac using Mac repair app, delete any unused apps, and restart your computer before downloading the updates. Sometimes problems during update installations happen because of your device not being optimized for the process. What to Do When High Sierra Update Fails and Black Screen Appears Other factors you should look into are your security settings, disk health, and possible virus infections. If you got a black screen after updating to High Sierra, you might want to check the SMC and NVRAM settings since these components are responsible for your Mac’s display. The update files could have been corrupted, resulting in an unsuccessful update.Īnother reason could be corrupted SMC and NVRAM. If you got a black screen after the High Sierra update installation, then it was possible that the update files had not been downloaded or installed correctly. What Causes Black Screen After High Sierra Update?
This problem is depressing, especially for those stuck in a black screen loop. Only by pressing the Power button can the device boot normally.
Choosing Restart from the Apple menu only brings up the black screen once again, and the users are stuck in a loop. Some Mac users who encountered a black screen after the High Sierra update and then did a hard reboot were also having trouble restarting their computers again. About Outbyte, uninstall instructions, EULA, Privacy Policy.
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