Ah found your problem:
Do not set the graphics card in your computer to exceed a resolution of 1280x1024@75Hz or the maximum refresh rate of 85Hz at lower resolutions; doing so may result in permanent damage to your LCD display.Information displays the timing mode (video signal input) coming from the graphics card in the computer, the LCD model number, the serial number, and the ViewSonic® website URL. See your graphics card’s user guide for instructions on changing the resolution and refresh rate (vertical frequency).
NOTE: VESA 1280 x 1024 @ 60Hz (recommended) means that the resolution
is 1280 x 1024 and the refresh rate is 60 Hertz.Also is the error your getting the one attached below...Resolution Notice displays the Resolution Notice menu shown below. Resolution Notice advises the optimal resolution to use.