Thanks for your reply.
I have tried this and it made no difference as there was no audio irrespective of the port I use. Nothing wrong with the port as it works fine when I plug another device into it.
I have a first generation Explora which is connected via HDMI to an Onkyo AVR. Have had no issues until recently when sound suddenly “disappeared”. When I plugged the Explora directly into the TV there were no sound problems and there are no issues when watching on remote TV’s connected via...