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Mac Won’t Install macOS Big Sur/Catalina Update (10.15
10 Solutions: Mac Won't Turn On After Update to macOS 10 10 Solutions: Mac Won't Turn On After Update to Catalina. The “Mac Won't Turn On After Update” issue can be caused by different reasons, here we collect 10 feasible solutions to get it fixed. #1 Restart. Whenever a problem occurs, restarting your device is always the simplest yet efficient way to fix it.