I’ve just set my machine up and walked through a few things over the last couple of days. Now I’ve turned on the machine on day three and the monitor is coming up with a blue screen with “no signal” across the center. The strange thing is that when I touch the screen, it homed the spindle. I can still moved through the menu screen on the monitor but nothing else. Is there some silly thing I’m overlooking that is an easy fix 
It sounds like the HDMI cable may not be plugged fully in on the controller or the monitor side.
I have unplugged everything on the screen and the control box. The screen does not come on, whats wrong with my machine.
email support@onefinitycnc.com with a detailed, narrated video of your issue.