@Haze, It's a pretty simple process actually
you have to be at the dashboard and not signed into any profiles
hit sign in and go onto your account
When it's signing in wait around 5 seconds
your gamerpic should pop up at the top.
as soon as this happens hit the guide button
You wont be able to see friends or messages but you can access the market place and your profile
You will still have the microsoft points so you should be able to buy stuff with them and then use the item on another account (same xbox)
You can also edit your Biography
Put Fuck in it somewhere then get people to report it
check your emails again
I Don't think that anything bad will come of this
You might get banned for accessing a banned account or something
I don't think anything has happened to me yet
i'm to lazy to ring microsoft at the moment