Desktop Video, Display and Touch

Hello,

I have a problem with my HP Envy 34 Display no longer working on my MacBook Pro (13 inch - 2017).

It worked absolutely fine previously, giving me charging, display and USB hub via the single USB-C cable. I believe that since upgrading to Mojave, the Mac does not detect the connection as a display and video signal is no longer being sent.

I have been using the USB-C cable supplied with the monitor which worked fine before, and I have also now purchased an official Apple Thunderbolt 3 cable recommended for display connections - this has not helped. I am NOT using the MacBook supplied USB-C charging cable.

The USB hub still connects, and the MacBook shows ENVY 34 along with the camera in the USB section of the system report - just that the Mac does not think it has had a display connected to it. There is no blinking of the screen when connecting and nothing appears in the display section of the Mac settings.

IF I connect the display via HDMI and the Apple HDMI/USB dongle, the display works just as before. I say “works” in the loosest terms - the picture is clear etc, but the HDMI only delivers 30Hz so is pretty much unusable (this is nothing new for the upgrade). I say this only to confirm that the display is not defective and does work.

Back to USB-C... The display itself believes that USB-C Video is Connected - it does not however say that it is active. It then says that the input signal has not been found, and that the display is going to sleep.

I have also tried both available **RAM reset key and restart combinations to no avail.

Any thoughts on how to get this working again?

Thanks in advance!