nRF52840DK ：Plug in the power and no response.
switch：ON
1658096323 said:Plug in the power
What power are you using? Where did you plug it?
1658096323 said:no response
Response to what?
What "response" were you expecting?
Have you followed the instructions in the User Guide?
1658096323 said:switch：ON
Which switch?
Note that there is also a "Power Source" Switch (SW9), and an "nRF only" switch (SW6) - are you sure you have the correct one ?
