- last post: 01.01.0001 12:00 AM PDT
I'm not sure specifically about Halo 2, but I know there's a setting on the XBox dashboard.
Turn the XBox on without a game in it, and go to 'Settings'. Somewhere in there (probably under 'Display' or 'Video', or something like that), there should be a setting for widescreen.
Set it to that and it should work, though I've never tried it yet.