It’s better to secure your data before you go ahead. As some of the troubleshooting methods may delete data from your system. Step 1: Recover data from not booting Mac using Remo Recover Macĭownload Remo Recover (Mac) tool and recover data first before performing any fixes.
Read on to learn about simple and effective solutions to resolve this problem. Before you proceed with the fixes, make sure to backup / recover data from your un-bootable Mac using Remo Recover, as there are chances of losing your data. In this article, let us discuss about methods to fix ‘Mac not booting after a High Sierra upgrade’ error. There are also complaints w.r.t installation errors such as Mac won't boot after installation, Mac grey screen of death error or getting stuck on the installation screen for hours etc. Upgrading to High Sierra has left many users unsatisfied with common complaints about security flaws, slow system, frequent system freezes and so on.
