1. Please check and make sure the correct input source is selected.

2. If a Windows-based notebook is connected, press "Windows Key + P" and make sure the Project settings is either on Duplicate or Extend. 

3. A defective HDMI or VGA cable can also cause such no signal problem.

4. Do not mix up HDMI 2.0 and HDMI 1.4 input ports as it may lead to a blank screen. *For IFP50 Gen1 and IFP60

Note: Above point 1-3 applies to IFP50 Gen1 /Gen 2/Gen 3, 30, 60 and 70 series.