I used boot camp to make my partition to install windows 7. It installs fine and after finishing installation when it loads the desktop its fine. However when it restarts all I get is a black screen with a blinking underscore _ I tried partitioning the drive myself too and even tried using rEFit. I am at a loss as to what to do. I've had it installed on here before so I don't know what is wrong. Any help would be MUCH appreciated. Thanks!