How in the world do I set up HDMI?

[The Riddler]

I have an HDMI cable, but I plug it all in, and though I get great quality, I lack sound.

Anything?

[The Seventh]

Hmmm... did you match up the cables to the right outlets?  Check again: the blue and green are similar colors, so it's fairly easy to mix up.

Did you also switch the out put to HDMI?  And plug in the right red cable?