Connected to DK, no response

[lewis]

I have two 52840DK, which can be used before, but I took it out and used it today. The led light on the rear panel of the USB is not lit, and the computer can't detect the port. I tried to use the onboard battery to power it. There is a board with a led light that can flash, and the other still has no reaction. What is the problem? How can I solve it?

[Martin Lesund]

Hi Lewis,

Could you go through the list in this thread?

Did the boards power up with the battery supply?

How do you flash the boards?

[lewis]

I am programming dk using nrfjprog