[ubuntu] Screen resolution of 1680x1050 leaves does not fill screen

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http://ubuntuforums.org – I just installed a Acer x223w 22" widescreen monitor. I have a GeForce FX 5500 video card running NVIDIA drivers 169.12 When I set the resolution to 1280x768 the entire screen is filled. When I set it to it's recommended resolution of 1680x1050 the left side of the screen has a 2 1/2 inch black bar. The screen is not filled as it should be. I'm running Hardy Heron 8.04 Any suggestions? (Hardware)