Im Windows 7, I use a Headset microphone to dictate to the computer. I was not sure at one point if the internal microphone was disabled or not and thought that maybe it was used instead of the headset microphone. I have tried to find a way to check this and search under Sound/Recording. There were two microphones there. I have identified the external one by the fact that if not connected the message 'not plugged in' appeared.
I have selected Properties and selected to disable it
Now a single (external) microphone is present under sound and there's no obvious setting there to re-enable it.
I went to Device manager and found two devices there, both displaying only the 'Disable' option.
I want to know how to enable the internal microphone and also what is the proper management of microphones for the purpose presented above.