Made slight change to /etc/network/interfaces and system won't boot GUI correctly

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http://askubuntu.com – I have a completely down server at this point. I am new to linux and brought up a server on ubuntu 12.10. I wanted to try KVM so I setup /etc/network/interfaces correctly for a bridge. As I learned a little more about the networking tools, I decided to use ethtool to change the speed of the bridge. I happened to place the ethtool command in the wrong location in the file and now the entire server boots to a screwed up GUI and I don't know how to recover. I could reinstall the server but I am really tired of doing that with ubuntu. I think the problem is that ubuntu doesn't like my Radeon (HowTos)