Hi, my brother asked to set up his 360 in our newly refurbished second living room, as there was a spare HD tv in there. He was still using an old TV from 2003. However, when I hooked it all up, I heard the boot up sound, but there was no picture. After that, I assume it froze, the controller kept flashing 4 green lights, and nothing seemed to work. I tried hooking it up with the regular AV cables, and it worked fine. I tried to swap it out while it was sill running, and I got a gray screen. I've tried looking up in the support thing, but it's no help. I got no response from the Ambassador thing. The TV works fine, We have a Blu-ray player and a Dish Joey, so its not the TV.