Hope somebody can help with this one.... I have a Radeon 9500 PRO card in my newly-completed computer. I am using a Samsung SyncMaster 900IFT monitor which has worked fine with my other computer. I get these horizontal scrolling lines on my display. Sometimes they are going up, other times down. They seem to be the most noticeable on light backgrounds, and usually they appear right after a screen change. I have set the monitor refresh rate to 85hz and am running at 1152x864 resolution. Does anyone have any ideas what might be causing this? Thank you for your help!