Have been searching everywhere for a solution to this problem since the last 4 days but in vain. have bought a new xbox 360. unpacked the whole box. it has come along with a standard av cable as given in (http://www.xbox.com/en-US/hardware/x/xboxstandardavcable/). there is no switch at the end of the console cable for HD/standard TV. both the TV & XBOX are off. Took the console cable and put it in the respective color code (RYB) into the TV. The other end is plugged into xbox 360. after that started the TV and put it in video mode. started the xbox. it has got started with all the green lights but there is no picture nor sound. Then I take the RB cables and connect it to the AUX (there is no provision to connect the yellow cable in the DVD AUX) in the DVD player and connect the DVD Player to the TV. now am able to get the sound but no display, obviously because there is no yellow port for the video. But then if I again connect it to the TV, in the same way the DVD player is connected, it does not work. pls help!