http://www.xbox-scene.com/articles/errorcodes.php
It's a kernal/dashboard failure. You tried to get rid of your dash, didn't you? I tried to talk you out of it. As far as the soft-modding thing, I have no idea how to go about fixing this. Maybe you can use an autoinstaller disc. I had to use mine to enable ftp so I could fix a problem I caused.
In any case, you should take this question over to
www.xbox-scene.com They should have better information over there, not to mention you won't get flamed for asking for xbox help in a Halo forum.
[edit] Also; forum etiquette; you should've just kept this to your original thread. I would've answered there.