I remember a similar thread a while back, did try searching but couldn't find it.
I moved my 360 to the lounge the other day from my bedroom, it worked fine. Turned it on today and I can't get any signal through the HDMI port. Tried various cables, to various ports - none work. The only way I can get it to display on my lounge TV is through the SCART cable.
I moved it back to my bedroom and it works fine on both SCART and HDMI in there. Both rooms have identical 40" Samsung TVs. I tried resetting the display settings to default in my bedroom and putting it back in the lounge but it still didn't work.
Already tried Google but there's not many answers on there.. and I've tried all the solutions offered. Any help is greatly appreciated!