Built-In Speakers on New Plasma

[NotGreyheim]

Hey tech! I recently purchased a 42" Panasonic 1080p plasma TV (TC-P42S1). I'm trying to get the built-in speakers working on it until I can get a better audio rig. I've got my PS3 hooked up to the HDMI-1 input (also tried HDMI-2 and 3), which according to the audio menu should be using the TV speakers. The problem I'm having is that there's no sound coming through at all. I've made sure the TV speakers are turned on.

In the advanced audio menu, the options for the HDMI inputs are as follows:
Digital
Component 1
Component 2
Video 1
Video 2

I apologize for my noobness, but this is my first experience with setting up a new TV, much less a Plasma. I'm more than happy to provide whatever additional info is needed to diagnose the issue. Google has failed me thus far

[Furtwangler]

should be digital, check your ps3 is also outputting its sound over hdmi (its in the setup somewhere)

[NotGreyheim]

That did it. PS3 was set to Optical instead of HDMI. Thanks Furt! :D