Mac air no audio

I'm not clear what "30 pin" refers to. It sounds irrelevant to your question or am I missing something?

Try this:
Go to System Preferences, click on Sound. Make sure you are on the Output tab. Select your device.

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Go in to the "applications>utilities" folder. Run the "Audio/MIDI Setup" program. Insure the audio out is actually going to the audio out.

Video Demo: http://www.youtube.com/watch?v=4Z8F4ip6Oy4

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Restore ur hardware and software configuration then try installation again

Usually an issue with the jack. The laptop thinks an optical link is plugged in and turns off the analog audio. Clean out the jack. If you want to do it yourself, the good news is, it'snot too hard to open it. Here is an Macbook Air Repair Guide that shows how to open an iPod. Just open it and let it try, clean off any corrosion you can find. If you want somebody else to do it for you go to iPad Repair NYC.

check your audio driver, if it is ok, check your sound options if it is muted, volume control..all are fine..then could be your speakers..if you use head phone to check it, and it does not work at all, then your audio driver, reinstall it

1/8th Stereo to Dual RCA Should do it..... If not 1/8th inch Stero to 1/8th inch Stereo should...

Sounds like either your sound card has died, or Mac OS X cannot find it. I suggest taking it to the Genius Bar at your local Apple Retail Store, or try reinstalling Mac OS X with the DVD's that came with your MacBook Air.
Hope all goes well!

Mac g5 sound output is echoing? what is the reason

Macs don't generally use a replaceable sound card in a slot like PCs. Instead they usually have sound capability built into the main board.
Which model of Mac do have and what model of CD player did you put in it?
Can you hear sound from sources other than the CD player - such as iTunes, internet, system alerts, etc?
As I recall, one CD drive I upgraded on an older Mac did require a light wire harness for the audio output. None of the DVD drives I have replaced recently have needed this.
Did you, personally, remove the old drive? If needed for the new drive, I'm guessing the old drive would have had an audio cable too.