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Pls Help! 1080 switched to 720 resolution; now no picture

We just got the fioptic installed today but the screen resolution was not great; it was stretching the image and the menus were expanded so we could not read the top, bottom, left, and right of the menu. I played around with 1080i vs. 1080 standard and there was little difference. I set it to 720p and now my TV won't recognize a signal at all. How can I get the DVR to reset so it recognizes it should be 1080 when I can't even see a signal on my TV? After that, how do I adjust the resolution so the aspect ratios are correct for programs and menus?