[ubuntu] Graphics problem in Ubuntu, but not in Windows

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http://ubuntuforums.org – Hello, I installed Ubuntu 11.04 after having Windows 7 on my HP Pavilion DV9000 laptop. Right away there were problems, at the login screen the background image had a bunch of horizontal lines going across, but the windows would pop up. It loaded up, and the default desktop background was doing the same thing, so i switched the background to a solid color and it was alright. However, I opened up Firefox and sure enough the same lines appeared in patches on it. I rebooted, and instead of booting into the login screen, the horizontal lines appeared everywhere and i couldn't access anything. This (Hardware)