Mac Won’t Turn On/Boot after Updating to macOS Big Sur
If the Mac does start up, restart it from the Apple menu once the desktop finishes loading completely. If the Mac starts up normally, go on with your day. Otherwise, keep working through this list. How to fix a Mac that won't boot or gets stuck on the Aug 10, 2019 Mac Will Not Shut Down, How-To Fix - AppleToolBox
How to Force Restart a MacBook, MacBook Air, and MacBook
Apr 14, 2020
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How to Fix a Mac That Stalls on the Gray Screen at Startup Jul 09, 2020 Mac won't boot/turn on after macOS Catalina/Big Sur update Jun 28, 2020 How to diagnose a Mac that will not boot after updating - CNET On rare occurrences people may find that after updating their Macs the system will not boot. Sometimes the system will hang at a specific boot screen such as the gray Apple, or at a blank blue screen. Mac Won’t Install macOS Big Sur/Catalina Update (10.15