[ubuntu] New 9.10 install trouible.

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http://ubuntuforums.org – I just did a install inside of windows, and everything was going great until I tried to install the ATI proprietary drivers. When I restart I get a blank black screen after the logo. Im running a ATI 4870 in this machine. Driver worked fine on my other similar system with a 4890. Tried several different installs, and different versions such as alt, and amd64. They all seem to do the same thing, Any ideas why this may be happening? Ubuntu 9.10 desktop i386 (Hardware)