Im not sure what forum to post this in as im not sure whats causing thise error.
Not optimum Mode: Recommended mode 1280 x 1024 60hz
This error now happens every time i try to adjust beyond 800x600
More aboutoptimum mode
"1280x1024 @ 60hz" is a common recommended/optimum resolution for 17" & 19" LCDs. You should have yours set on that and have the most current video card driver.
To add to what Hose said... in order for an LCD to look any good for desktop use, you need to run it at the one (and only one) resolution that it was designed for. This would be the maximum resolution that your monitor supports.