"HDMI no signal" from my touch screen Monitor

[OnefinityCNC (Onefinity Support)]

No signal on Screen / No video output from BB controller - Troubleshooting Video

If the screen is turning on and showing a blue splash screen but no input video, try the following: (this should be an obvious first step, but make sure everything is plugged in exactly as this faq shows (a lot of people forget the wall power plug): How to connect the Touch Display (7, 8, 10.8")) Ensure the Big Red Physical Estop on the black control box is up/released. Twist and pull up hard to release it. The controller will not turn on (no lights, no fan sound from inside the box) and not…