hey boss not sure if it helps but had something slightly similar happen with a jtag on kinnect dash I just got. I think it is a bug in kinect dash....but no one has reported it or something. Nways here is what happened to me and what i did to fix...out the box when I pressed eject this jtag showed me xell and my keys etc via component soooo I knew my gpu wasn't screwed....but with tray closed trying to load the regular dash i got sound no video...switched to hdmi no sound no video (the tv i used doesn't support autoscaling i believe but nway) i was worred so i switched to regular sd no sound or video so I was bugging and worried I just got a lemon...then I tried vga and poof it booted properly...it still wouldn't work with other cables but since I use vga I didn't truly care...contacted original owner and whatdayaknow he had last used it on vga...so 360 is rememebering settings under new dash I guess..he suggested restoring to default settings...all I could find in new dash is run initial setup...did that and she started working with other cables again...I realize this may not be option for you but figured I would share my story...my idea is restore it to last known working settings and try connecting it to the last tv it worked on...so I guess 1080i??