Your PC video resoliton is set too high for the monitor to display, it shoulde be set to the native resoltion of this monitor: 1280 x 1024 @60Hz.
http://www.fixya.com/support/r4873371-fixing_out_range_format_not_supported
http://www.viewsonic.com.au/product_pdfs/lcd/17/E-VA720-10142003.pdf
Unless the monitor has the problem inside:
http://s807.photobucket.com/albums/yy352/budm/Viewsonic%20VA721/
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