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

[dgrissom]

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? 

[Bcd]

In this entry, 'rcosta', had the same USB problem:

https://devzone.nordicsemi.com/f/nordic-q-a/23427/nrf52840-preview-dk-not-appear-as-a-removable-drive

I have just had the same problem.

With the original USB cable included in the pack, the nRF52840 DK is not working. I have tried with 4 USB cables; with 2 cables is working and with other 2 is not working. 

I have Windows 10 Home 64 bits, processor based on x64, as occurred with 'rcosta', I don´t know if it could have some relation with this USB problem.

It is quite and unpredectible behaviour for me.

[Joakim Jakobsen]

Maybe you could create a new ticket about this?

Best regards.

[3Dtj]

Wow!!  I totally had the same issue.  One USB cord got the DK to be powered up with the LED to flash but File Explorer didn't detect the DK.  I read this post and used a different USB and by golly it works.  Frustrating but hey it works now.  :)