![]() Rating 3.36 (11 Votes) When installing a major Mac OS update over an existing one (not using a clean install), or when using Apple's Migration Assistant to transfer files and preferences from one Mac to another, you will often run into trouble with drivers not working properly, authorizations being lost or corrupted etc. If you have data loss problem after macOS update, EaseUS Data Recovery Wizard for Mac provides tried-and-true data recovery service to you. Whatever is preventing your Mac from starting up, follow these 5 simple solutions to get it working again. Mac fails to boot or start after the macOS update. ![]() Fix 3: Use Disk Utility in Recovery Mode. Check if your Mac can successfully boot into macOS High Sierra after update. Restart your Mac and simultaneously press 'Command+Option+P+R' keys. If your Mac computer won't start/boot after updating to High Sierra, you can try to reset NVRAM and PRAM to fix the unbootable Mac.
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