No audio during mkv playback

I downloaded an mkv file with 6 Ch AC3 @ 384 kbps audio but there is no sound during playback. anyone help?

You’re not alone.  See this thread

http://community.wdc.com/t5/WD-TV-HD/HDMI-audio-no-sound/td-p/2800

It’s ok, problem sorted, changed the audio output from digital to stereo and it works on the audio file mentioned, thanks anyway