well if everything was as you said it, then he wouldnt be banned. The xenium chip is 99.999999% off when you boot to the stock bios not even m$ can catch that. The only thing that stays on is the led and thats just to keep noobs from logging onto live with the hacked bios. Is it possible that his gamertag was flagged from cussing or cheating, because that can get you gt flagged as well, The only difference is that you dont know about it. So when he logged in and they scanned him they saw the large hdd and BAN on his first log in.