Diagnose integrity of microphone and logic board
I am have not been able to use the microphone on my macbook pro v13 mid 2010 for some time now and I am trying to determine the cause of the trouble. If I can get enough feedback I will try and make a help me guide for diagnosing the problem.
I am currently running Mac OS10.8.2
Here is what I know:
1.) The logic board identifies that the Internal Built-in microphone is present and displays the option in system sound preferences. This is the same for the Line-In from the input port
2.) I see no activity from the input level from either the built in or the line-in microphones. However, if I plug-in or remove a microphone into the input port I see a quick fluctuation on the Input level of the line-in.
3.) I have checked the Audio MIDI options and adjusted the format to all possibilities given under the windows options, no change.
How possible is it that there is a bad connection with the microphone cable given the trouble exist for both the Internal and line-in microphones? Is there anything else I can check?
Is this a good question?