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.

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