What model TV is it? Maybe, if itīs a bit older, the HDMI is just a DVI "in disguise", meant for PC only (with DVI-HDMI adapter), therefore not able to accept sound.
Or the TV maybe is incabable of HDSPA, but that should give you no picture as well (maybe
would affect only HD-DVD)?
Have been using this box as an exploit box for a while now, however i took it to main tv which uses hdmi and i found that its displayed as dvi allowing me to choose vga resolutions but there is no sound via hdmi (obviously vga uses sound via opticalor analogue).
Video and sound are fine via component - have applied xclamps ok and reheated southbridge and ram so im not convinced its a hw issue.
Some threads on xs re it say disable auto checking in display but i havnt got that menu option... (is nxe dash)
Any suggestions ?