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nrf52840 PDK is not recognized by computer anymore

I used to program my PCBs using the nrf52840 PDK, however, my mac no longer recognized the PDK. The PDK turns on and the application runs as LED 4 blinks but the LEDs next to the PCA10056 do not turn on so I believe there is an issue with the debugging chip.

Any ideas on what is happening?

Thanks

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