[ubuntu] BLACK Screen after installing Nvidia drivers

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http://ubuntuforums.org – Hi, im using Ubuntu 10.04 LTS. I have a lot of stuff on there, from class and so on. Im quite new to Ubuntu. I wanted to play some games. I noticed a really poor performance on 3D games, and I realized the nVidia card was not being used because the driver was not installed. I have a GT540M on my laptop. So I went to System->Administration->Additional Drivers and the nVidia driver was found as missing and ready to install, so I clicked and waited for it to install. When it was done I closed the window and restarted. When I tried to boot up, I only got a black screen with "Ubuntu Lo (Hardware)