My 360 used to work perfectly through the HDMI port into my Samsung TV. I turned it on one day to see that half the picture had become distorted horizontally and after rebooting the picture completely disappeared leaving me with the TV's standard blue screen. It hasn't worked since and I've been connecting with the av lead.
Anyone else had this problem or can help me with a solution? I have tried setting the resolution up differently which does not work.
Try to reset the display settings with the HDMI cable plugged in.Turn the Xbox on with your controller. While pressing the Guide Button, press and hold the Right Trigger and Y at the same time until the Xbox logo appears. See if that solves your problem.