I don't know the answer, but HDMI (digital) is better than Composite (analog).

HDMI cables are only a few dollars on-line ...

pink/green sounds like setup issue. tv works but dvd does not so i vote for dvd player being the problem. have you tried another dvd player as a test on the bedroom tv?

I also beleive its in the setup of the dvd player. Try unhooking the player and bring it back to the original tv. I bet it wasn't using component cables , simply composite video. Go into the dvd menu and determine its video output-480i/480p/.
Using component video cables allow the dvd player to be in 480p and your picture should look proper.

PS- HDMI are not necessaryily better and dont come into play here.

sounds like you plugged the blue and green in the wrong input/output happens a lot!

electronicbase,

I think you are right. The video output is 480i and the plasma is 1080p. Could it be an incompatibility issue? Could it be that the progressive scan does not allow for the picture to be converted to 1080i/1080p?