Whats your mainboard? did you update your mainboards BIOS? Also, if its an older AGP based system, it could be to do with the type of AGP port you have, there were several revisions all utilising different voltage specifications, and unless the card met that specification, your graphics card would get fried. For example, you put a 1.5v AGP card in a 3.3v AGP slot, you would kill the card in no time flat. If you put a 3.3v AGP card in a 1.5v AGP slot, either nothing would happen, or you would most probably fry the AGP slot where it was trying to provide more power than it was supposed to.
WARNING: I am cracking down on stupidity in the forums. Anyone caught making a dumb statement clearly not knowing many, if any of the facts, will promptly be directed to xtremesystems.
Sig edited. If anyone wants to know about the E4400 (E7200 sold) drop me a PM