I am new to Ubuntu and I have installed Ubuntu 13.04 on an old Dell Dimension 2350 with an old tube style Dell monitor. When I open a web page with a streaming video the video plays with sound but the image is half size and the color looks like a negative photo. All other images on web pages appear crisp and have great color quality. Also have the same issue with online games. What do I need to to to make the steaming video play correctly?