Emerald :
did you check the Sound output option on your computer?
Hi... and thank you, had to build on your comments but resolved. All hdmi, pc output to av, I used games input port as I do not have games to play, Sony tv has a pc input but not necessary to use as the Onkyo av is hooked up anyway. Changed pc output from the Sound menu on the pc to have the av receiver as default and ...voila, all OK. The only other thing is for me to select Games on the av or remote for the av. If I want the pc speaker system, I just change the default back to Speakers on the Sound menu of the pc. A back and forth thing, that's not much. Thanks again, much appreciated.