I have a Sony Trinitron 19" flatscreen (not thinscreen) CRT monitor. When I switch into lower resolutions like 800x600 and 640x480 I notice thin horizontal lines. I've attached an image to show what I mean The left side is taken with a 320 x 240 resolution and the second image with a 1024 x 760 resolution. You will notice that the lower resolution has many little horizontal lines between each row of pixels. I'm wondering why this is.