Sometimes, if the Mac computer cables are not connected properly, you may not be able to boot it normally. Reset SMC to fix Mac won't boot after High Sierra update Just follow any one of offered methods to get your Mac computer back to work again now: Quick Fix 1. If you are having such a problem, relax! This tutorial article will show you how to quickly fix and resolve Mac hard drive won't boot issue after macOS High Sierra update. But it's still a tough case for ordinary users to fix when their Mac computers fail to boot after macOS High Sierra update or installation. What else can I do to wake up the computer and make it work again with macOS High Sierra?'Īlthough Mac hard drive boot failure issue is not a new problem anymore. I tried to hard reboot Mac computer, but nothing showed up. And when I completed the update process, tried to start the computer. ' I upgraded my iMac into latest macOS High Sierra last night.

Mac won't start/boot after macOS High Sierra update/installation, help!

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