I thin k waht is happening is your default resolution is set to something that the monitor is not design to operate at. what you need to do it start your computer in safe mode. as yo boot the computer press the f8 key and start in safe mode with mouse support. then right click o our desk top and lower your resolution. You are probably going to want to operate it at 800X600 resolution.. set your resolutio to that then turn the computer off through windows and reboot
Your monitor should display properly after that.