Typically, when the refresh rate reverts, does the setting change in "Display Properties"? Because my setting still shows 85 hz. Refresh Force doesn't work. I thought it might be the driver or the video card going bad, but I got an old driver (Radeon LE) and that didn't help, and I swapped video cards with another machine, and both cards work fine. I'm baffled. The only thing I can think of is to reinstall Windows. Thanks for your response.