If still nothing, plug your Mac into Ethernet (if possible–if not, make sure it’s connected to WiFi) and follow these exact steps:.

How Do You Fix a Mac That Won’t Turn Start-Up and Boot?.

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macOS Could Not Be Installed, How To Fix.

PSA: macOS Catalina will kill your 32-bit apps - here’s what you should know.

How-To Factory Reset MacBook Air and other macs with macOS.

How to use Finder in macOS Catalina to Sync and Restore iPhone If your MacBook or other Mac does not start up at all after macOS High Sierra/Sierra update and hangs on a gray screen with an Apple Logo, here are some steps to consider: Related Articles

The majority of these problems are usually related to third-party software running on your MacBook. At AppleToolbox have seen these issues with almost every major macOS or OS X release.

Some users report that their MacBooks and other Macs will not start after macOS update to macOS Mojave, High Sierra, or older macOS Sierra. Is your Mac not booting up after the latest macOS update? Or seeing a white, gray, or other Mac screen of death? If so, don’t panic! You’re not alone.

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