How do I set up an HD5570 to run three monitors? I don't do gaming, just various Windows apps. I have two flat screen monitors, one connected to the DVi output, the other connected to the HDMI output. The third "monitor" is a Toshiba 32" TV is connected via the VGA output of the card. I can get any two monitors to work at a time, but not all three. How do I set this up?