Are you sure your new component is on the DVI2 port (right one)? The DVI1 port is hard-wired to the DVD function, and I would assume that if you hook up a cable there that has signal, and the 1070 video select is on Auto it may choose the DVI input as the "better" choice because your component cables might be sending in 480i, but the DVI port (preferred choice) might be seeing something different.

I'm just guessing here, but if your DVI cable is on the wrong port (in order to see the Samsung you should have to be on Video2, which is hard-wired to DVI2) try the other one, or go into the input setup for DVD and manually set it for Component and see if that makes any difference.