Just booted up my Flashed Xbox 360 for the first time today, Using an HDMI Cable, Everything powers up right on the Xbox 360, Lights etc buts it Saying No Signal on my TV. I have tested 3 HDMI Cables still nothing. Tried the Xbox on 3 different TV's still nothing. Should I try an Original Grey Cable (Component cables and AV cables) that comes with the Xbox or does my problem lie else way? Any help?