I have a Jtag that has been working fine... I updated the latest dash and all was fine and dandy... then my wife went to play with it when i was gone and she went thru the "new user startup" thingy that teaches you how to use your xbox, and after a reboot there has been no video signal ever again. the box looks like its working green lights as normal... but no video signal at all. Anyone have any idea what this could be and how to possibly fix it? Have tried resetting the display settings with the hold Y and pull right trigger at boot up but that didnt work.. tried all manner of versions of it to be sure.. waiting a while... pushing simultaneously etc. I also tried to do blindly call up the shut down menu with the center button on the joystick and 2 down to shut down the xbox but nothing happens.