I have a Bluetimes MX5 android tv box for the past year or so. The HDMI has stopped working the last few weeks. Only the standard AV is working. I tried a few things at the weekend but still no joy. There was a glimmer of hope when I first connected after disabling auto detect hdmi settings, the picture came up for a few seconds and then went blank again. I''ve reflashed the image on it but still no joy. I've tried different cables and TVs but all the same. Any ideas what could be causing this?