Hi if you xbox is fragging with out a chip in it then i would say you motherboard has a problem i am not sure if this could be fixed but you can get replacment motherboards on ebay for around £45
i have seen peeps offring a repair service on ebay as well search for xbox motherboard on ebay and you will see a few options, make sure you know what version xbox you have as you will need to get the right motherboard to put back in. here is a link that will tell you how to tell what version you have
http://www.xbox-scene.com/versions_1.phpRegards
Nick
