Try doing a factory default
I did a factory default. And that did not work when I applied the HDMI settings.
Try doing a factory default
you should also check for networking conflicts..
I would never give up so many things to try first but if you did all you can send it back
and you tried this http://iptvtalk.net/showthread.php?530-how-to-reset-your-box
It sounds like the HDMI cable might be bad. Try a new HDMI cable.