Hi @saif, the ZC706 is a Zynq-7000 board. Currently, we provide a windowing system (only through DisplayPort, not HDMI) for boards that are ZynqUltrascale (like the ZCU104).
Also, I am wondering what “prebuilt” image you are using for that board since we don’t support and don’t ship images for that.
Can you explain exactly what steps you did to create the image for ZC706?
In general though, I think what you are trying to do is not going to be possible. At least not using PYNQ as is. I would suggest you look for projects that enable a linux windowing system for Zynq-7000 boards, and try to replicate these. You can then merge the required configs and FPGA design into our sdbuild flow and rebuild a PYNQ image that ships a linux gui for your board.
An example you might want to consider (though it’s a bit old): https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18842231/Zynq-7000+AP+SoC+-+Installing+the+Ubuntu+Desktop+on+PetaLinux+and+Demo+Tech+Tip
We don’t have any PYNQ resource to help you with that, sorry.