Any idea why when I watch my premium channels, why they do not fit the screen, but all the other channels do?
Your post is unclear. The title implies that ONLY HBO HD is not showing in HD, but the body of your thread says none of your Premium channels come through in HD. Which is the case? Just HBO? Or all Premium Networks? Please respond so that we can begin to help.
I would check your tv settings to ensure the right screen resolution is being used. Another thing you could try which is the "typical" is unplug the power, wait 30 seconds, and then plug back in. You could also swap the equipment out at local office at no charge. Let us know if any of these work.