To get the best image, you should configure the computer to use the exact resolution of the TV's display panel. TVs rescale video signals which have different resolutions to match the resolution of their displays, but often with poor results. You'll have to consult the TV's manual to find out the correct resolution. If you've lost the manual, most manufacturers provide them on the Web for free.
Marantz SR7009/7.1.4/FH+TM/DefTech PM1000/LCR+TM amped