I presently have hooked up a Samsung 28" 4K monitor (U28E590D) via an HDMI cable to my Mac mini (2018). When the display works, it works very well. However, there have been numerous occasions, when -- during boot up -- handshaking does not talk place so I'm left with a blank display, and me forcing the Mac to quit (occasionally, switching the monitor on and off does the trick: sometimes not). I'm, perhaps naïvely, thinking that switching the connection from HDMI connection to a Display Port/Thunderbolt 3 connection may alleviate the problem... any thoughts appreciated.