I have an Onkyo 606 Receiver which is now about 6 months old. One of the HDMI inputs doesn't appear to be picking up sound although the video is fine. I've tried using a different hdmi cable and using a different source but the problem persists with the input regardless of whether the source is my DVD or satellite box - both of which work fine through the other inputs.

Q-tip and RUBBING ALCOHOL (anything else will damage the connection) very carefully clean out the input. then use a vaccum on low setting and place it over the input and pull out whatever debris is left. repeat if need be. In the future if you want to protect any connection on the avr or any component you may have place a piece of tape over the input to keep dirt or dust out. the q-tip and rubbing will clean up the tape when you go to use that particular connection.Home theater has been my hobby since 1993,the above is what I know to work.hope this helps you.