I started using linux about a week ago and chose ubuntu 12.10 to start out with.
I ran it dual boot with windows 7. Played with it for about a week and everything was going great then I loaded up minecraft and noticed it was running poorly.
So I thought I haven't done anything with my graphics yet so why not try installing new drivers. I removed my current drivers then went out and downloaded it from amd and extracted it then ran it through the terminal.
Everything went fine and it was successful so I rebooted. By the time it loaded back up I got to the purple screen and heard the login sound then nothing. Just purple screen. I'm using a Radeon HD 6950 if that is relevant to the problem.
I tried using recovery mode, my boot loader is unaffected by all this, to remove the new drivers and reinstall the old ones but quickly realized I was over my head and didn't make any changes.
I know how powerful the terminal can be and I'm still a bit hesitant to really dive into it without some direction.