Hi I have a iMXQpro with 5.1.1 sw .Bought about 6 weeks ago and all is fine apart from the output from the av port,which I tried for the first time today.There doesn't seem to be any output at all.I've connected the audio cables,of an av cable,to an amplifier and there's no sound and when I connect to a tv there's no sound or video.a/v cable was working ok on previous box.Have had a look for a setting but no luck.Any ideas please?Cheers.Mark