Quote: from Indecisive at 9:52 am on Feb. 19, 2007
Is this a ripped copy of linux... you may have a minor bug or glich if its not the real deal...Maybe you should try just messing around with different resolutions... just to see what happens just because you think its the right one doesn't mean it is... Not trying to insult you... 
Ripped copy of linux? There is no such thing, Fedora core is free, as in both beer and freedom.
At any rate, your video card is supported to some extent, albeit not with 3d support until you install the proprietary nVidia drivers, but that probably isn't the issue here.
Where did you set the screen resolution, counter-intuitively there are two places it is set, one to set the size of the screen, and the other to set the resolution it displays at.
Go to the Gnome menu, then go to System > Administration > Display
From the Display panel you can set the size and type of the screen.
Once that is set right, go to System > Preferences > Screen Resolution, and set the screen resolution there.
If both of those fail, you need to look at the xorg.conf file, located in /etc/X11 , and edit it to whatever it ought to be, make a backup copy of it in the same directory first, as if things go wrong you will have to copy it back, probably using the command line. (using the cp or mv commands, copy and move respectively)