Check the connector ports for damage

1. Check the port for loose or broken pins
2. Inspect the inside for visible damage
3. Determine if the connection is intermittent by wiggling the external Microphone devices
4. Connect to Support Assist installed on the computer.  If it is not installed click here to install it on the computer.  Once connected support assist will attempt to resolve the issue.

Yes, I'm using the blue connector on the rear of the box.  The mic I'm using is a simple lapel mic and it works on another computer.  I've also tried using the line-out from a piece of audio equipment.

The jack physically looks fine.  

Note that as I mentioned in my post I do get a dialog pop up when I insert the mic into the jack.  See photo below.

The nature of my problem isn't that there's no sound, but rather the operating system doesn't appear to see the mic.  If I go into settings, I see "No input devices".

Try each of the below connection steps, if they apply to your situation, to correct issues involving microphone connections.

 
1. Disconnect and reconnect the plug. Even if the plug was already connected to the correct connector, reconnecting might help if there is a connection problem between the plug and socket.

 
2. Connect the microphone (or the source device used for line-in) to another computer or audio device. If a microphone or source device does not work with another audio device, replace it. Does the mic work on another computer?

Curtisdehaven,

Thank you for your reply.  Please connect to the Support  Assist app to resolve the issue.  Information in the previous post.

Yeah, I saw that....  That was a lot of help.  Not. 

Please try these steps,

Go to device manager and look for audio controllers.

Check if there is any error on Microphone driver.

Look for sound video and game controller and check if there is any error. Share a screenshot of it.

I've unplugged and plugged it back in several times with several different devices.  They all work fine on another computer.

Service Tag is

Screen shot of Device Manager...

Edit: When I double click on any of those 3 devices, I see "This device is working properly."

Thank you for reaching out to us. We’d be glad to look into this for you right away. Before we proceed, we strongly recommend that you remove the Service Tag from the public post for security reasons. Also, as our interaction would involve sharing sensitive information, please private message us so that we can start working toward a resolution.

Please share the image via private note.

Hi I just solved this problem fir a customer last week 

1. update bios to newest version 

2. update chipset 

3. Update real Tek audio driver
4. check device manger for camera 

5. go to settings make microphone is set up

i hope this works for you

james onsite tech for Unisys / Dell

Curtisdehaven,

Thank you for the information.