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nRF52840 Preview PDK JLINK drive does not show up in file explorer

The PDK does not show up in file explorer. Power switch in VDD position. LED 1 is on solid.  The device manager universal Serial Bus controllers does not list any device that looks like the Preview SDK board.  I have changed to a different computer, swapped out the USB cable, switched HUBs. LED 1 is slowly pulsing with brightness change and buttons change which LED is pulsing.  LED 6 is flashing rapidly.  Any idea's on what I can do to get the JLINK drive showing again? 

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