You can SSH into the controller and see the logs/output there. I'm not sure if you can directly run the cgminer from there (never tried) but it should work.
Thanks for your response. As mentioned, currently displayed on my screen is the standard Linux bootup messages, resulting in a root shell.
I would like to view the controller interface on the screen I have connected directly to the controller's HDMI port, instead of having to remote in to the controller via
http://192.168.0.100 (or the IP I've configured)