Never before had a problem with Ubuntu desktop graphical display; Trying to use nvidia GT630

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http://askubuntu.com – I've been using ubuntu since 9.04 and never had a problem with Ubuntu bringing up the desktop graphical user interface. However I am currently not able to see anything graphical past the install screens. I have an Intel DP55KG motherboard and just installed an nvidia gt630 graphics card (zotac), since the old graphics card failed. I can install the server and see text. So I do a apt-get install ubuntu-desktop...or apt-get install kubuntu-desktop...or apt-get install xubuntu desktop, but after the reboot there is no display...its like something is hung up. I tried using the Live quantal dv (HowTos)