Ok, I have a Samsung Syncmaster 950p and a Leadtek GeForce 256 DDR. If I display my desktop in 1024x768 everything is all good. Same with 1600x1200, these are too large and small respectively. However, if I try to use any resolution between these two there are some weird halo like lines that start from the side of the screen and go across the monitor. Different resolutions and different refresh rates cause different patterns. They aren't circular in the sense that they form circles,so maybe halo wasn't a good word to describe them. They also vary in density and width with different refresh rate and resolution combos.