That is a very odd problem. Try resetting the box. What type of box is it? What company do you have? Where did you get the DVI-HDMI converter/cable? Keep in mind some HD TVs have a specific input for DVI-HDMI converters.
There is a reason why I asked what type of box it is... A lot of boxes have different settings to change for SD and HD. Getting to the settings can be tricky also...
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