Nrf52840 preview dk not getting detected

[nileshpassi]

I have brought nrf52840 preview dk ,it is not getting detected by the computer nor its power led getting light up. Last code i  tested  on its was blinky.

I doubt it has any hardware issue as i have not interfaced any device  with the dk.

I have also checked the test point  around switching circuit on dk it was ok.

[sborman]

Quit the Arduino IDE if you happen to have it open.

I ran into this problem of a new NRF 52840 DK not connecting to my Mac.  Nothing showed up even after following the useful suggestions here.  The problem I found was that I had the Arduino IDE open on my Mac.

Solution:

Quit the Arduino IDE application. Disconnect the DK. Reconnect the DK.  Turn it on.

You should see the DK show up under "Locations" in the Finder sidebar as "JLINK".

You should also see the device on the USB tree as follows (some lines removed for clarity):

% ioreg -p IOUSB
+-o Root  <class IORegistryEntry, id 0x100000100, retain 17>
  +-o AppleUSBXHCI Root Hub Simulation@14000000  <class AppleUSBRootHubDevice, id 0x100000346, registered, matched, active, busy 0 (2 ms), retain 19>
    +-o J-Link@14300000  <class AppleUSBDevice, id 0x10001e5ca, registered, matched, active, busy 0 (44 ms), retain 19>