Ok, that's sort of good news, but you're far from out of the woods. It means that you either have a problem in the receiver, in the part that switches the HDMI output between the selected input or the internally generated video (HMG, settings screen), or that there is some weird setting that has changed somewhere (Input signal type, resolution, you name it...)
I can think of two relatively simple tests to attempt to prove failure in the SC-07:
1) Disconnect EVERYTHING from the AVR (yes, I know...) and connect only the power and ANOTHER HDMI display or monitor, using another HDMI cable. Go in HMG and see if you have a green screen or not
2) If you still have a green screen, do a factory reset of both the display, if available, and the SC-07.
If I were in front of the system, I might do some other checks before doing those tests, but there's nothing that comes to mind right now. What is the brand and model of your TV?