Did you try sax2 -m 0=vesa
Did you load the nVidia proprietary video driver or just use the default driver? Does Linux startup, but just KDE or Gnome does not start?
If Linux runs, but you can't get a graphics desktop to run, you might try the following command at the terminal prompt.
sax2 -m 0=vesa
See if that get you going with the new video card installed.
Thank You,
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