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Mac Mini hangs on boot up after OS update

My Mac mini was running fine last night when I shut it down. But this morning it won't boot up. The Apple logo appears, and then the progress bar very slowly fills up, but at the end it just hangs.

I get the same results when trying to boot up in Safe mode and Recovery mode.

I believe this has to do with a software update. I had a prompt from Apple asking to install updates yesterday and selected "Try Tonight." Now it won't boot up.

Any assistance would be greatly appreciated.

Try an SMC reset:

Reset the System Management Controller (SMC) on your Mac - Apple Support

最後更新：2017-08-20 23:32:42

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