Hi all - I upgraded the graphics card in my Dimension 8300 to a ATI radeon 9800 about 5 months ago and, until recently, had no problems. During the last couple weeks, however, after extended game play with high-end graphics intensive games (Splinter Cell, Half-Life), the graphics have begun to break up into gibberish (polygons, lines, etc.) I've been told that it may be due to an inadequate power supply (250 w) (I've increased the hard drive capacity but otherwise everything else is original equipment - dvd and cd-rom drive). My other thoughts is a faulty fan, but it seems to be running. Re; the power supply, I get mixed messages from reading previous forum discussions - some say 250 w should be more than enough, others recommend upgrading. Thoughts? Is there a consensus that an psu upgrade is necessary? If so, what should I worry about in choosing the new psu?