https://devzone.nordicsemi.com/f/nordic-q-a/27922/running-mbed-ble-example-without-debugger-attachedI&#39;m using the nRF52 DK with mbed, running the heart rate monitor demo app. When I disconnect the board from the PC and attach a USB power supply instead, the nRF52 won&#39;t boot. Re-attaching to the PC and power cycling causes it to boot again. Isen-USTelligent Community 13Thu, 07 Dec 2017 12:07:02 GMThttps://devzone.nordicsemi.com/thread/110196?ContentTypeID=1Thu, 07 Dec 2017 12:07:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4194dc37-6ff9-4418-9b8d-36914f2f51d9MartinBL<p>Have you tried Matt &#39;s suggestion? Have you made any progress? It shouldn&#39;t be necessary to set any flags.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/110195?ContentTypeID=1Sun, 03 Dec 2017 23:39:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:388b55fe-24f5-4c4d-b72e-5427352774c7Matt<p>Try another USB power supply.</p><div style="clear:both;"></div>