Built-in microphone issue

Hi,
I have an issue with my built-in microphone : it looks like it is "de-activated" or I don't know... I want to use the pronunciation option in Rosetta stone, but the mic is not "recognizing" any sound in the software. I checked in the System Preferences menu, under Sound, and when a select the mic line, the sound bar doesn't react when I talk. However, when I click to select "Input line", the mic seems to react for half a second, and then, nothing again.
Any clues ?

Mic
Take your computer to an Apple Store or an AASP for a looksee. Hopefully, your MBP is still under warranty and/or you have Apple Care.
*Super drive*
Another help source (if you haven't already done so).
Go to your OS Help Menu. In the search field type dvd
Click on all the troubleshooting topics & Support Articles that pertain to your issue.
You can also do the same in Disk Utility. Open same up.
At the bottom left of the window, click on the purple button w/the "?" in the middle.
This will bring up the Help Menu.
===============
Try a different brand. Top forum favorites
CDs
FUJI
TDK
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DVDs
Maxell
Make sure the DVDs are not dirty, smudged and/or scratched.
http://docs.info.apple.com/article.html?artnum=50448 How to Handle and Clean CD and DVD Discs
Your drive may need cleaning. Cleaning kits can be purchased from any store that sells CD/DVDs.

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