I have a Medion MD-1567 Pentium 4 that has SIS on board graphics. I put in a Nvidia AGP graphics card (GeForce 3 older gen) with a DVI connected widescreen Hanns-G monitor that is made for 1440x900 resolution. All works OK but I get a crazy flashing screen when I right click on any movie file that is set to view as a thumbnail, when the windows screen appears during start up, when windows desktop first comes up during start up, and also when I bring up the Nvidia control panel or display settings. This isn't the end of the world but I'd like to eliminate if possible. Does anyone think it might be related to drivers loaded for the Sis onboard graphics? I noticed there are Sis651 drivers loaded on the add and remove screen but I'm concerned they might also run the AGP port that the Nvidia driver is plugged into or perhaps control more than just on board graphics. If anyone thinks I could safely remove, please let me know. Also, any other ideas would be appreciated. I've gone as far as reloading windows cleanly, trying other Nvidia drivers but it hasn't eliminated my jumping screen.