i have a 55" samsung w/ 4 hdmi slots. one has the dvd player plugged into it. my tv, etc, operates from a harmony 510 remote which has direct tv, dvd, radio, and ipod on it. i don't see ANY source buttons on the tv (there are usb openings, etc, by the hdmi ports. i plug in the droidx, thinking it should just 'play' the pictures, etc. nothing. is this a samsung issue, a harmony remote issue, or a droidx issue? thx for any help.