When I first turned it on, it was like this also. I immediately went to go update the firmware from 1.1.0 to 1.2.2. I don't think the firmware fixed anything because the issue was still there for awhile and then magically went away.
I've been messing with the 7D for the past few hours and then decided to format the CF card that I've been using. This screen issue came back after I did that.
I've been powering it on and off, resetting settings, formatting the CF card, removing the battery...out of ideas right now.
Here's a video of it also:
I've tried googling and searching the forums but either I don't know how to search or I'm by myself on this one because I can't find anything about this issue. Help