I have now test and discovered that if I removed the image.elf file (Genode kernel+rom modules) in Grub, that then there is no exceptions 0xe or 06 going on in Nova (on 'c' press).
So I now think that Nova loads and run Genode, but that there is so much errors going on on my machine that nothing shows up on the screen.
I intend to find Genode entry point and see how I can investigate this.