To rescue it, you are advised to check and repair the disk with Apple’s built-in disk repair tool, Disk Utility, under macOS recovery mode. If your Mac has problems booting up after the macOS update, it’s possible your Mac computer ran out of power, and the APFS reformatting process was interrupted, or the startup disk was corrupted. Step 1: Boot into macOS Recovery mode to check the Mac hard drive Now you can take a look at each of the steps. Check if any program is not compatible with your macOS.Check if the Mac hard drive is corrupted.Let’s go straight to the point you are suggested to troubleshoot this issue by the following steps: Solutions to fix Mac not turning on after macOS update When your Mac doesn’t boot up, let’s keep on reading. This post will provide you with three steps. It could be really annoying when you urgently run your Mac, be it an iMac or a MacBook.

However, many mac users found that a macOS update made their Mac not boot up. A new Mac OS is designed to improve user experience. Apple releases major Mac operating system updates annually, while minor system updates happen every two or three months.

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