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No HDMI signal on Mac Mini after reboot or wake...

I upgraded my Mac Mini 2011 from Mac OS Sierra to Mac OS High Sierra

During the upgrade process my screen went black. I was able to get it back in disconnecting and reconnecting the HDMI cable on the Mac Mini.

Every time, I wake the Mini from sleep, the screen stays black. The same also happens after a reboot. Dis- & reconnecting the HDMI cable brings it back to work. Turning my TV off and on is not sufficient.

I did a reset of the PVRAM How to reset NVRAM on your Mac - Apple Support with no change

I had to recalibrate my display as some of my e-mails were showing up in black: Re: Conversation view in Mail broken in High Sierra

Any hints?

最后更新：2017-10-01 11:29:12

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