[ubuntu] Can't boot with 9600gt, Jaunty

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http://ubuntuforums.org – Ola! My recently bought NVidia 9600gt video card causes hangs during a booting of previously installed Ubuntu. Yes, I've removed elder drivers. The worst of all is that Ubuntu can't run with this video card from LiveCD too. I haven't try to install other OSes (like Windows) with the new video card, maybe they won't work too. My power supply seems to be ok: Thermaltake TR2-550W. How I could cure the trouble? (Hardware)