Did anyone meet such display issue?
I tried multiple cables/monitors, restart the sigmaTile, but never manage to have the display working.
It works well ( using ethernet)
But as i cannot have it working on a monitor, i can not enable/configure wifi.
There are two ways to configure the wi-fi. The first is as you said, through a monitor. This does take a significant amount of extra electrical power, so make sure you've connected the Pi to a power source that delivers at least 1 amp worth of current.
The other way is to access via SSH and follow this document:
Let me know if you have any more questions,
In my case update the file with "config_hdmi_boost=4" didn't solved the issue.
I had update it with the following options
Then after a reboot the screen connected in HDMI was working.