I don't know what this could be. I have a Viewsonic P25F 22inch monitor. In the upper right hand corner it is shaking? Like somehting is vibrating the screen. At first I thought it was the refresh ...

This just started yesterday. It's a Sony G400, had it for about 3 months. It's set at 1280x1024, 85Hz, and the picture has just started vibrating. Is this a problem with my machine, or the monitor, ...