Out of Range Signal (60 Hz)

[ksiads]

The monitor displays the following when I try to run the game:

Out of Range Signal
Cannot display this video mode.
Change computer display input to 1920 X 1200 @ 60Hz


Ubuntu 8.04
Nvidia GeForce 7300 LE
Default Resolution: 1920 X 1200 @ 50Hz
Monitor: Dell 2407 Widescreen Flat Panel

When I fire up the game, I hear the audio, but no display. The monitor appears to be looking for the 60Hz refresh rate but I can't select 60Hz in Ubuntu under System->Preferences->Screen Resolution.

What can I do?