I agree, it's definately your resolution being set to high for the monitor to handle. In the past ive always gone into Safe mode and reset the reolution etc and it's always worked for me. If it doesn't work go into Safe mode and uninstall the video driver and re-boot into Windows which will reset the resolution anyway. Then re-install the driver.
Just for the recored if you have a flat screen the refresh won't have any effect it's the architecture of flat screens. Basically it has to light the pixels rather than a CRT has a tube with a beam of light whizzing around the hogher the refresh the clearer the picture. this doesn't apply to flat screens.