The theory is that you've screwed yourself by getting your original eeprom, your big hd and your stock hd all banned. Oh, you've got your gamertag flagged as well and will need a new one if you want to use a big hd on live too.
The Halo 2/Nov 9th XBL Bannings - AKA Marriage TheoryFrom what I can tell, you only get banned if you swap your HD *after* you first go onto XBL with a given Xbox.
If you're planning to upgrade an Xbox's HD, you need to do it before you first connect it to XBL.
But if you didn't do your upgrade before you signed on to XBL with that Xbox the first time, then you depending on the dates you did sign on, you might have to change your harddrive AND eeprom! Or you could just get another xbox and leave it stock

And finally, remember to use an XBL blocking BIOS so you don't get banned for having an active modchip!
more info:
http://forums.xbox-s...howtopic=304652 <-- GO HERE!!