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nRF52 DK LD5 Not flashing

I just opened my nRF52 DK and tried to flash the board. I got the error

ERROR: There is no debugger connected to the PC

Most concerning is that the LD5 light does not light up. I tried powering it on while holding IF BOOT/RESET button to enter into bootloader mode but nothing happened.

I've tried a number of microUSB cables including ones that have been able to program other boards.

The NRF52832 chip seems to work fine and the program where the LED corresponding to the last push button pressed runs fine.

Most people who have solved this issue all appear to have the LD5 light flashing, so I'm wondering if my board is just broken.

Is this a known issue? Is there any way to fix it?

(For reference, I am working on a Mac with OS 10.12)

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