My Xbox 360 Isnt Working, but I Dont Have Any Rings of Death. When It Turns On, Nothing Appears on the Screen.?

ive replaced those red white and yellow cords, but still, nothing appears on the screen. please help me fast:(

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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