Built in microphone not working

The issue can occur due to corrupted drivers or incorrect settings of microphone.
I recommend you to follow the steps in the below links:

http://notebook-solutions.blogspot.com/2009_06_01_archive.html
http://www.acerpanam.com/synapse/forms/portal20.cfm?recordid=1146&formid=3390&website=AcerPanAm.com&siteid=7117&words=All&keywords=microphone&areaid

If you have corrected all the options, drivers are reinstalled or updated and if the issue still persists then follow the below steps:

Open Run and type mmsys.cpl and click on OK.
click on Test Hardware option in Voice tab and follow the onscreen instructions.
The internal microphone option should be selected when the related window appears.
You can now check if your microphone works or not.


You can see the green bar beside the Recording option which represents the working of the microphone, if you get the message that your voice is not detected click on Back and check the Internal Microphone and now the microphone should work.