@antigrunge2 , @carlsbad , I applied some of my computer repair skills and fixed the issue.
I connected my TV to the HDMI “Service Only” port on the rear. As I expected the TV showed the POST (power on self test) status. An error message was showing indicating that I needed to select an appropriate boot device. Seems like it wasn’t finding the boot disk.
So I connected a USB keyboard to the DAC output and sure enough it worked, allowing me to reset the device and enter the BIOS. I looked at the boot devices and I wasn’t sure what the boot device should be. So, I simply selected “reset to defaults”. After I did that, everything worked just fine! I’ve had issues in the past with computers seemingly randomly changing its boot devices and getting confused. Seems like this is what happened.
One small concern I have is that there was also an option to “reset to user default”, as opposed to “factory defaults”. I’m not sure if the Zenith ships with general factory BIOS settings, or if there is a “user” set of defaults the unit ships with. I’ll check in with Innuos to clear that up. But for now everything is working just fine!