Hi all, I've had this problem for a while now and just found these support pages. When my Wii is hooked up with component cables, and I go to play a virtual console title, I am unable to see the game. The screen turns black, but I can hear the music from the game. If I press the home button, I can then see the game behind the Wii menu prompts. So to play the virtual games, I have had to reconnect with a/v cables and then I can see the games fine. Any ideas?
Since your AV cables work fine, you should just resort to using those for Virtual Console games.
As for the component cables not working, the following steps may help if all regular games display fine with these cables.
What To Do: