Please ensure that when you disconnected the HDMI cable, the
USB cable did not happen to come lose? HDMI is only responsible for handling
the video, the USB cable is what allows touch functionality.
Also please make sure that the USB connection that goes from
the Panel to the ActivConnect is not in the USB OTG port.
Kind regards,MarthaPromethean Technical Support
In that case, what we would recommend is trying to flash the
Bezel Firmware on the panel itself. This will typically assist with any touch
issues that you may encounter.
The following article will assist you on how to perform this
Please let us know the results, we look forward to assisting
you in this matter further.