[quote name='BrieEyeball']Are you sure that they won't work with Wii? All of my nintendo A/V cables seem to work with all of my nintendo systems. Is there something different with component cables or are you just assuming incorrectly?[/quote]
the Wii will use a similar port, but the Wii component cable will also carry the audio signal. the GC component cable has no provision for audio out, as that part's handled by the GC's analog a/v port. hence, it won't work.