1. positioning adjustment of the monitor itself.
2. the resolution setting.
3. the refresh rate.
so try all three or combination of all three. Good luck.
I installed Ubuntu on a refurbished Compaq AMD 64 4000+ (1Gb RAM, Nvidia 6300 SE) using a Viewsonic 19" LCD display. The initial install went OK but when I changed to the NVidia Drivers that came with the distribution and this made the desktop shift to the right and I now have a 2 inch dark bar on the left side and cannot see the right side. Is there a way to recenter the desktop as the menu on my monitor does not allow me to do this.