Just received a 2018 Mini. Would not output video via either HDMI or display port. Tried a couple different monitors, cables, etc. Eventually called Apple support and they didn't seem all that surprised. So it's going back for a return. Haven't seen this reported and perhaps I was just unlucky. I would think this kind of issue would be identified with any kind of bench test, so this implies they aren't bench tested. I seem to be having a string of bad luck with Apple. Ordered an iMac last Spring as a replacement for a 2012 mini. It would not stream any video or audio source after sleeping. Spent many hours with Apple tech folks with no resolution and I decided to hang with my mini rather than exchanging it. Now the mini is DOA. Not sure if I'm going to exchange it or just return it. My 2012 is needing an upgrade, but at least it works.