Please check IFP/device/cable:
1.Check settings on IFP.
a. Please check and make sure the correct input source is selected.
b. Try different HDMI port on IFP.
2.Please check setting on laptop/PC.
If a Windows-based notebook is connected, press "Windows Key + P" and make sure the Project settings is either on Duplicate or Extend.
3.Please try another HDMI or VGA cable.
If above steps don’t help, please contact ViewSonic service center.