I'm currently using a Radeon 9700 Pro and it has been working fine for quite some time (I forget exactly how long). But it’s been misbehaving lately. Colored (blue and yellow, to be specific) lines run vertically across the screen, congregating around things like desktop icons and my pointer. Polygons are stretched to some infinitely distant point. And my frame rate drops to nearly nothing. The first problem has been rather on and off, while the second two inevitably happen a few minutes into almost any of my games. Any help?