Suggestion:
Do you have the HD/Standard tv switch set to the wrong setting?
This thing:
http://www.google.com/imgres?imgurl=http://img381.imageshack.us/img381/328/cableswitch5ia.jpg&imgrefurl=http://forum.teamxbox.com/showthread.php%3Ft%3D384469&h=417&w=555&sz=31&tbnid=73EBtjdia4yzKM:&tbnh=100&tbnw=133&prev=/images%3Fq%3Dxbox360%2Bhd%2Bswitch&zoom=1&q=xbox360+hd+switch&usg=__wozBAxAec1AsM2BFpu-RgQMg7C0=&sa=X&ei=eCDQTLjPM4yosAOwtrynAw&ved=0CCAQ9QEwAQ

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