Chances are your flat screen CRT television supports some high definition (either 480i for older models, or possibly 1080i) but it won't support progressive scan (480p, 720p). How you should set it up is plug in the Red, Green and Blue into the component input in your television and then plug in the White and Red to the corresponding spots for audio. Check your manual for your TV and see what HD it supports and then set (if the Xbox 360 doesn't default) to that resolution.