I just heard that XBox has a recall out on the power cord. Go here Xbox recall to see if your cord falls with in the affected dates.
"Does my console require a replacement cord?
If it was manufactured before October 23, 2003, your console requires a replacement cord (except for consoles purchased in Continental Europe, where consoles manufactured prior to January 13, 2004 require a replacement cord). Consoles manufactured after October 23, 2003 (after January 13, 2004 for consoles purchased in Continental Europe) do not require replacement cords because design improvements to the cord and console already protect against the problems that are addressed by the replacement cords. "
<!--EDIT|jwcfbd
Reason for Edit: None given...|1108675470 -->
"Does my console require a replacement cord?
If it was manufactured before October 23, 2003, your console requires a replacement cord (except for consoles purchased in Continental Europe, where consoles manufactured prior to January 13, 2004 require a replacement cord). Consoles manufactured after October 23, 2003 (after January 13, 2004 for consoles purchased in Continental Europe) do not require replacement cords because design improvements to the cord and console already protect against the problems that are addressed by the replacement cords. "
<!--EDIT|jwcfbd
Reason for Edit: None given...|1108675470 -->