video problem on install

Tue Aug 18 06:54:22 UTC 2009

Trashed my hd and when I did reinstall I got a screen of colored rectangles.
No change to computer since original install (9.04)  Using nvidia 7900gs on
asus p5 mb. How can I find out problem and correct?

Also am considering getting ati 4850, any one have one and how does it work
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