Phantom 4 Pro Plus.  In an attempt to get these goggles to work I have tried a different HDMI cable, Rx swich on goggles to "o", powered goggles up last.   Verified HDMI output of controller is functioning by connecting to television and seeing drone's camera image. Please help...dyin to try this copter in FPV.

Did you switch the goggles to 2d hdmi input?  The default is analogue.