https://devzone.nordicsemi.com/f/nordic-q-a/24743/nrf52840-dk-power-on-faildHi I have 3 nRF52840 DK, just shipped this week. And two could power on success. But one failed to power on after connecting with same USB cable. The LDE5 did not light up and no COM PORT found with my Computer. Other two board could work fineen-USTelligent Community 13Tue, 29 Aug 2017 09:18:44 GMThttps://devzone.nordicsemi.com/thread/97441?ContentTypeID=1Tue, 29 Aug 2017 09:18:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8051e7a1-71b4-40bd-a2f3-695e36513524jones<p>Hi Martin,</p> <p>I found the problem. We adjust the switch to &quot;nRF ONLY&quot;, after switch back to &quot;DEFAULT&quot;</p> <p>The DK works normally</p> <p>Thanks</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/97440?ContentTypeID=1Tue, 29 Aug 2017 08:35:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:caeaebb1-9ce1-4ed7-89d7-224c8905d610MartinBL<p>Hi, Can you please try/answer all of the suggestions in <a href="https://devzone.nordicsemi.com/question/164807/my-nrf52nrf51-dk-kit-doesnt-work/">this thread</a>?</p><div style="clear:both;"></div>