On 42" panasonic plasma tv when dvd player plays its a green colour.When normal tv is on the picture is perfect.
If dvd player is connected to tv with component cables, make sure the blue and green cables are in the right colored inputs, at both ends. Also, if using component cables, set dvd player to "Progressive Scan". Double check all the settings, in the dvd player's and tv's, setup menus. If all this is set correctly, try a different input on the tv. Let us know how it goes?