Back speaker port not working, front port works fine

Hey. New Mac Pro owner. Great machine. Having a bit of trouble. There's no sound coming from my speakers (typical audio port computer speakers) when plugged into the back speaker port (I tried both ports just in case). When I try, sound comes from the internal speaker. However, when I plug the speakers into the front port, sound plays fine.
I went to System Preferences > Sound, and tried setting "Play alerts and sound effects through" to Line Out, but the back port still isn't working. I also tried a headset I have, and same deal; sound through the front, not through the back. Looking for advice. I haven't tried opening the case to see if anything doesn't look right, but my experience inside computers has been with purely Windows boxes. Thanks in advance.

You need to set the default output for sound on the Sound>Output tab to Built-in line output.
I have never noticed this before because I've never used headphones with my Mac before (not directly plugged in to the Mac anyway lol), but if you are looking at the Sound>Output tab and plug headphones into the front, the top option changes from "Internal Speakers" to "Headphones". Then, of course, if you click on headphones it enables the front output..
There are more sound settings in Audio Midi Setup in the Applications/utilities folder. You probably won't need them but fyi...

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Back speaker port not working, front port works fine

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