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, Help!
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