What source are you using? Cable Box? Cable tuner? DVD? Computer?
Most of the time your TV's remote will have a button that says "Aspect" or "View Mode" or "Zoom" they can stretch zoom and distort the screen and cause this.
If it is a DVD or Set Top Box you may have to go into the menu or set-up screen and change the aspect ratio to that of your TV.
Let me know if that helps, any more details would be great.
Thanks!
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