Dig through the menus - there should be a Image Shift setting that will align the picture correctly.
You might also try resetting it to the factory settings:
With the TV on, hold down the Reset button on the remote and press the Power button on the TV.
The TV will power on and off, then release the Reset button.
(you do have the remote, right?)
Otherwise, try Googling the model number and downloading the manual.
Good luck!
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