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Released on July 21, 2011. Core i5 or Core i7 Processor. Thunderbolt. This unit is also used to run the Mac mini Server configuration.

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Can anyone tell me what this port is for?

I accidentally broke it when I upgraded my hard drive in my 2012 Mac Mini (The one in the red circle)

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That connector is the IR sensor connector. On the front there is both a White LED and this IR sensor.

Review Step 13 in this guide Mac mini Mid 2011 Logic Board Replacement there should be a cable hanging in that corner of the shell with the Black, Red & White wires

If you snapped it off the logic board you might be able to re-solder it on as long at the pads are still present and not torn off. Even if they are, someone with good skills can patch things together by adding jumper wires to replace the pads.

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