I just formattd my Compaq Presario 2100us. With a Radeon Mobility 320M. I downloaded all the graphics card drivers, http://h10025.www1.hp.com/ewfrf/wc/softwareList?os=228&lc=en&cc=us&dlc=en&product=375243&lang=en Including the one that said fixed video playback problems. However, that did not fix the problem. Any help would be appreciated.