Whenever I reboot my 2018 Mac Mini, I either lose video when it comes back up or the video is standard def instead of widescreen with a large, vertical black band on the left hand side of the monitor. The only thing that seems to fix it in both cases is unplugging and replugging the HDMI cable. Sick of doing that and wondering if anyone has a fix? Thanks!
The first thing I’d try would be another cable, making sure you get one that matches the Mini’s specs.