How to Connect An Xbox 360 to Your TV
By Eric Qualls, About.com Guide
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A/V Cable HDTV Switch
If, and only if, you have an HDTV and want to use your Xbox 360 in 480p, 720p, or 1080i resolutions you have to slide a little switch over on your A/V cable. On the end of the A/V cable that connects to the Xbox 360, there is a little switch that you'll need to click over. If you do not have an HDTV, you can skip this step.