Latitude E7250 w/ docking bay audio problem

@WendyJM  If you're using the E-Port dock, audio rerouting is supposed to be automatic.  I've used and worked with many of those docks since I work in IT.  Unlike newer docks that have an audio chipset within the dock that appears as a separate audio device in Windows and has to be selected as the output device, the E-Port docks are essentially just pin extensions from the internal system, so the dock's audio output jack is wired all the way back to the system's internal audio chip (through the underside docking connector) and therefore should operate exactly like a headphone jack built into the laptop itself.  If that's not working as expected, even after fiddling with the plug you're inserting into that connector and verifying that you're plugging into the audio output jack on the dock rather than the mic input jack below it, then it could be a problem with the connector on the dock itself.  I've personally seen 2 E-Port docks develop a problem that rendered their audio output jack useless.

@WendyJM  You don't select an audio output with that sort of dock.  The system and dock are designed to use the built-in speakers if nothing is connected to the dock or the system's built-in headphone jack, and to automatically redirect audio to the dock's audio output jack when speakers/headphones are connected to it.  If that isn't happening, then I don't think there's anything you can do to achieve output through the dock's audio jack.  The dock isn't identified as an actual separate device, so there's no other "device" to select to send audio to the dock.  It's a much simpler electrical system, where if the system detects a device inserted in the dock jack (which it can do because that jack is attached to pins that ultimately go all the way back into the system through the dock and the system's underside dock connector), then it redirects audio at a hardware level -- not an OS/driver level -- to that jack rather than routing audio out to the built-in speakers.  This is how headphone jacks built into laptops used to work as well, before they got a bit more intelligent and at least some systems allowed the built-in speakers and the headphone/speaker output jack to be treated as separate devices.

@WendyJM  Here's a workaround for you.  Get a USB audio adapter like this one.  You can plug that into a USB port on the dock.  That WILL show up as a separate audio device within Windows, since USB audio devices do not rely on the system's built-in audio chipset, and then you can plug your speakers/headphones into that jack and select that adapter as your output device.

This was a refurbished bay, so how do I select the audio output (she asked hoping that is the problem), if all else fails I can use the earphone jack on the computer.