Unable to connect Nvidia Jetson to a monitor

I used an HDMI to plugin the jetson and the monitor, but screens were blank. I am able to ssh and login via SSH. I used this (https://www.waveshare.com/wiki/JetRacer_AI_Kit) to setup the jetson and the jet racer. Is there anything that I am missing?

Thanks!

Is this purely HDMI without an adapter? Other types can lack auto configuration ability. In the case that it is HDMI, then you might check this debugging URL:
https://elinux.org/Jetson/General_debug