this is a
cableing issiue. I assume you are playing it through a
SVHS cord. check to see which pins may be bent. If it is true and none of the pins are bent then you simply need a new cable.
wikipedia talks about these color and non color pins
http://en.wikipedia.org/wiki/S-VideoIf you are not using
SVHS cables and instead are using the RGB or red green and blue RCA connectors then you may have them on the wrong color on either the DVD or the TV get a light to be certain the color you were trying to line up was the right one.
You may have a bad cable here as well. on the back of the unit it doesn't say
RGB it says component Pb Pr and Y but just look at the colors of the RCA jacks. Side note here you can use a different cord to test them out, even one of the red, white and yellow cables, Just make sure that the jack goes green to green and so on you don't have to have a green cable in between it, it is helpful but not necessary.
also for reference here is the manual
http://www.panasonic.com/consumer_electronics/live_manuals/media/pa029/pkg/manual/PA029_02.html
