I bought an XBox 360 as a birthday gift yesterday. It was connected to a HDTV via HDMI (the same cable used for a PS3) all day where it worked perfectly. The next day the console was moved to another room (again HDTV which connects to a PS3 via HDMI). This time the console wasn't detected when turned on, and even using the supplied composite cable yielded no results. The console was then moved back into the first room, except this time the HDMI cable didn't seem to work with it (still works with the PS3 though). The supplied composite cable also only works if the switch is on TV (if I use the green/blue/red part, switch to HDMI and go to that channel no results are yielded). After spending many hours trying to fix this problem, which included going to a great many websites and lugging the console to and forth I have unfortunately not gotten any closer to fixing this problem, so would appreciate any assistance on this matter (since I simply want to use a perfectly working HDMI cable on a HDTV).