RE: Video card installation problemo.
You should really always uninstall the drivers before changing card, especially from nvidia to ati (or vice versa). Uninstall the drivers then google and run "driver cleaner" in safe mode to completely remove the nvidia drivers, then put the new card in and see if it boots. If it does, live with the horrible display for a while and download the newest ati drivers for that card and install them =p
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