[ubuntu] 12.04 Upgrade failed

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http://ubuntuforums.org – I just tried upgrading my gateway laptop from11.10 to 12.04. Everything seemed to go smoothly until the end when it rebooted. The login screen looks the same, but it is black. The background still says 11.10. The password box does not show stars as I type. It looks like it is showing white text on a white background - the cursor seems to move, but you can't see anything. It accepts the password, but nothing looks right. It looks black, and windows will flash on the screen when I mouse over them. Clicking turns the bacground purple. Basically, you can't see anything. Any help will (Hardware)