As this is the Community User Forum, this delegates the ZorinGroup to focus on troubleshooting received bug reports and help requests as well as continued development of Zorin OS and ZorinGrid.
After reading your entire thread, several factors become clear:
Multiple monitors show this.
Using Different cables showed this, as well as assigning the correct port.
Another system does not show this.
And what it is showing is a clear race condition between NUC7I7DNB and i915
The system tries to get the EDID from the monitor, PLL fails to lock, and the process repeats until the race condition halts, and the message from the monitor is finally received.
Which leads to: Is Your computer BIOS out of date?
Has the BIOS been updated?
This would be your first step because most likely, this is the cause.
While in your BIOS Settings, check these three things:
- Disable Display Power Saving / Deep S4/S5 (if present)
- Set Primary Display = Auto or External
- Disable legacy video / CSM if enabled