I've done it and it still shows a black screen when I try to log on.

Edit: Hm. The black screen is still there, but I was able to click on the place needed to log on, and it now shows the login screen with the two green bars. I can edit my profile, but nothing really shows up, just the outline of the box that opens up to allow me to edit it. If I click start, it goes straight to a black screen once again.