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When I plug in the screen and I turn on the Mac Mini, I see the Apple logo and the OS loading. After macOS boots the external screen goes black.

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I would suspect PRAM has some bad contents. Check this article on how to reset PRAM:

https://support.apple.com/en-us/HT204063

Additionally, you may need to reset SMC:

https://support.apple.com/en-us/HT201295

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