Mac mini 2018 running Mojave 10.14.6; Dell S3320DGF 32' QHD monitor (2560x1440p, max. Refresh 165Hz), 1x DisplayPort 1.4 connector, 2x HDMI 2.0 connectors; With an HDMI input, my monitor will run. Jan 29, 2020 Mini DisplayPort: Connects to HDMI using a third-party Mini DisplayPort to HDMI adaptor or cable. Mac computers that have an HDMI port comply with HDMI 1.4b and support: At least 1080p video over HDMI, and some Mac models support higher resolutions when connecting to 4K displays, 5K displays and Ultra HD TVs. You can connect the HDMI cable to the HDMI port on your Mac to a second monitor or TV. Whether you want to use a second screen or you want to export full audio and video display on your TV, connecting your devices is a lot easier with HDMI. Some Mac models, such as the Mac mini, also rely on HDMI to connect the computer to the display.

Hi, guys!

I found this topic when I faced same strange behavior of HDMI on my Mac Mini.

Like it was described in other posts, randomly HDMI—>TV doesn’t start after that Mac Mini restarts.

Boot mac from usb for pc windows 10. I noticed, this issue appeared after turning on of FileVault Encryption of System Drive.

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It seems strange, but similar bug exists on my Mac Book Pro: its keyboard backlight doesn’t work at login screen until user enters Login/Password and System Drive is decrypted.

As I understand, macOS has troubles with start of some drivers in case if system drive was encrypted with FileVault before.

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I disabled encryption on the main Mac Mini drive and I didn’t have the mentioned troubles anymore: signal from HDMI goes to TV flawless.