Cant open display : xrandr --output HDMI-0

Hello @RobertCNelson ,
I am on uSD (32GB), I can try this.I need to do basic functionalities from the GUI like editor,network configuration and some custom GUI tool running.
Do I need to install anything extra apart from what I did above?
I can try with

video=HDMI-A-1:1024x768@60e

btw my uEnv.txt has just the kernel image name.( uname_r=4.7.9-bone3)

Thanks and Regards,