Try one of two things:
1. Edit your xorg.conf. If you are not sure how, post it here, and someone will take a look at it (/etc/X11/xorg.conf)
2. Check Screen Resolution tool, what is the maximum allowed resolution? Or you can try using nvidia-settings:
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You can also take a look at /var/log/Xorg.0.log to see what resolution it try to set when X is starting up, I know I have some issues with a nVidia card, I can't get the resolution to 1366x768 with the proprietary driver, but the nv driver handles it just fine.