No audio with mini-DVI to HDTV

Hi - I know this is a tired discussion but I haven't been able to find an answer. Can you help?
Here is my tv: http://www.lg.com/us/tvs/lg-42LE5400-led-lcd-tv
Here is a picture of the back of the tv:
I have a late 2007 (3,1) Macbook and an LG LED LCD model 42LE5400 tv. I'm trying to get audio and video to the tv. Video works perfectly but I have no audio.
I have a mini-DVI adapter connected to a HDMI cable running to the HDMI1 spot on the tv.
I also have a male-male audio cable with a y-RCA adapter (red and white ends).
I understand that the HDMI cable won't carry audio through the mini-DVI and that I may need external speakers but I want to explore all the options before resorting to that, since I don't have a stereo sound system. I do have some cheapie desktop computer speakers, however.
So. Which jack to I plug the audio cable into? I've tried lots of things, including the regular headphone jack. Still nothing.
Thanks for any help!
Sara

Here is the solutuion! This is a picture of the correct placement of cables, making it possible to watch an older Macbook on a newer tv.
First, the details:
The laptop: regular old Macbook 3,1, late 2007 running OSX 10.5.8
The tv: a now discontinued LG model 42LE5400. It's a 42" LED LCD.
The cables and adapters: I purchased this set of cables online. It was pretty reasonably price, but I'm sure the same ones are available on Amazon for less. This link is for cables specific to my computer, make sure to choose the ones that'll work for your system.
http://www.macbook2tv.com/p/mac-mini-dvi-to-hdmi-kit-with-audio.html
The kit comes with a mini-DVI to HDMI adapter, an HDMI cable, an audio cable with standard 3.5 ends, and a Y-like RCA adapter (red and white connectors). I didn't need the RCA adapter.
Attach the HDMI cable to the mini-DVI adapter and plug it into the mini-DVI port on the Macbook. The HDMI cable then runs from the computer to one of the HDMI inputs on the tv.
Plug one end of the audio cable into the headphone jack on your Macbook. The other end goes into the RGB/DVI input on the tv.
Turn on the tv, select the HDMI input and after some flashing screens you should be set!
Hope this helps!

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The problem is not with in the adapter. The quality on the external LCD or Plasma depends the most on the graphic cards. Thats that.
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Message was edited by: BakaBaka

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