White banding on Panasonic42PWD



I just setup my Panasonic TH42PWD5UY with digital cable, DVD.
I noticed a horizonal light colored white (10") band that runs from the bottom to the top. It takes about 15 seconds to go up.
I notice it only on the dark colored backgrounds, like night shots.
I have a Yamaha surround sound system attached.
The line is present with cable tv or DVD.
I am inclined to believe it is some sort of electrical interferance.
Any idea's what to look for to fix this.......
Thanks, Tim

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