NO sound on HDTV connected to iMac

I'm trying to connect my iMac to my Panasonic HDTV (model TH42PZ80U).
I've connected an Apple Mini DVD-to-DVI cable to a DVI-to-HDMI cable.
Then I'm connected to HDMI port 2 on the TV.
Video from my iMac is working great on the HDTV!
However, when I connect my RCA audio cable to my HDTV, there's NO SOUND coming from the TV.
Audio plays fine from my iMac when the RCA cable is not connected.
I've toyed with all the TV's audio controls to no avail.
I've tested the RCA audio cable on my computer speakers and it works, so I know the cable is ok.
I'm going from my iMac's digital audio out port to the TV's audio in port (red/white connectors).
Any advice/help would be greatly appreciated! Thanks!

Normally, the HDMI cable carries the audio signal as well as the video signal. So the HDTV may be expecting the audio to be on the HDMI connection, by default. However, the iMac's video output port (that you are converting to HDMI) does not carry audio. So you are doing the right thing by using a separate cable, converted to RCA connections, to run from the iMac's audio output to your HDTV.
You should check the RCA connections you are using on the HDTV to make sure they are associated with the HDMI connection. My older HDTV has RCA connectors for audio that is grouped with the HDMI connector. So the audio input can come from either the HDMI cable or those RCA connectors. I just need to make sure I am using the correct pair of RCA connectors in back.
It is possible your HDTV may not have such separate RCA connectors that go just with the HDMI connector. In that case, there may be an internal setting, accessed from your HDTV screen menu, where you can select the RCA connectors as the sound input source.
Also, make sure the sound volume setting for Headphones is not muted. Mac OS X keeps separate sound volume settings for the built-in speakers and the headphones (when something is plugged into the audio port). So your built-in speakers may be set to a comfortable volume, while the headphones may be set to mute, and then you would not hear anything on the HDTV.

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