nvidia driver install problems

[jonsnipes]

i have a nvidia ge5200 256mb card vga and dvi out.  when i upgrade to the nvidia restricted driver and reboot the tv (vizio 50"plasma) wont rea the signal and i have to hook up an old crt screen in order to see anything..  after booted up i can switch cables over to the tv and show the screen but only in the vga..  the dvi doesnt work..  however when going into nvidia settings it does detect the model of th screen.  ive tried using other programs for upgrading the driver with the same result..  after the install i can never seem to get the xserver to work right again and end up reinstalling ubuntu again and again. i am now using 7.04 still with no luck..  ive tried adding and editing the xorg with no luck.  any ideas??