No sound from hdmi cable

The DVI adapter stops the audio. Use the audio out ports on the bluray player to connect an audio pair cable to the tv.

Check your sound settings on the dvd player should be pcm
Turn off dvd player and tv and make sure tv is turned on first

U tries all the HDMI ports on the tv,might have a short and dead the one HDMI port,u tries,with all of those three HDMI cables.

the only thing i can think of is that you havent flicked the switch on the hdmi cables wher the plug into the xbox from tv to hdmi, if you have the go ahead and get it replaced

sure you have blue ray?

I did solve the puzzle what I did was to, disconnect the HDMI cable and reconnected via component video and it worked well. I am still not sure why it wouldn't play with HDMI as all my other blu ray discs played OK.The TV is a Samsung 52in lcd.

Yes, you can connect the HDMI Cable from the Blu-ray Player to the TV directly and then, connect the Digital Optical cable from the Blu-ray Player to the Receiver.

You say this doesn't happen on regular cable or when playing a regular DVD. Hmm. Is this Blu-Ray player connected by simplink? HDMI is a bi-directional format cable, so  there are cases in setups where your tv can send commands to your blu-ray player and vice versa. It could be a problem with your blu-ray player that it is sending for some odd reason a mute command to your tv. Or is processing a command that your TV interprets to be a mute command when playing blu-rays. Because if it was the TV itself chances are you'd see this when watching a normal DVD or on cable as well. Since you say you're not, it leads me to believe the issue lies with the blu-ray player itself. 

You can try out by connecting the CVBS (Yello) out from player to TV and connect HDMI out from Player to TV. Goto CVBS input on Sony TV. Select set up and you should get the HDMI Video options availble. Try to change the resulution and check for Video on HDMI source.
Which disc you were playing PAL or NTSC? PAL should work for Europe.

Your amplifier should "downgrade" the signal to 5.1, even if the disc isn't using it. It is most likely a setting on your amp that may need adjusting for "types" of digital to accept on its input. If you can, set your optical input on your amp to "auto". This way it will automatically detect and switch for the proper incoming audio feed