https://devzone.nordicsemi.com/f/nordic-q-a/75476/nrf52840-dk-is-not-powering-onHi, My nRF52840 DK has suddenly stopped working. I have tried different USB cables but it&#39;s not turning ON when I connect the cable to the J 2 USB connector. Observation: It is working only with USB mode (1.8V) and LED5 also turned ON and also ableen-USTelligent Community 13Tue, 25 May 2021 14:14:36 GMThttps://devzone.nordicsemi.com/thread/311525?ContentTypeID=1Tue, 25 May 2021 14:14:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3a226911-189d-4bb8-8962-0b25b4cf10a0Simonr<p>Hi</p> <p>Please also make sure that SW6 is set back to default and that the USB cable from J3 is removed when you revert it to VDD mode. If that doesn&#39;t help, please try turning it on in USB mode and do an nrfjprog --recover or --eraseall as you might have flashed firmware onto the nRF52 SoC causing this for some reason.</p> <p>If that also fails, please go through the points listed in <a href="https://devzone.nordicsemi.com/f/nordic-q-a/24592/my-nrf52-nrf51-dk-kit-doesn-t-work">this case</a>, with some common troubleshooting issues to make sure your DK is operational.</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>