nrf52840DK board issues , devices are not connected when try to flash the code

Hi I  have recently bought the product nrf52840 from Digi key, i have dumped the code so many times but now days it is showing the error.   the issues is whenever iam trying to dump the code it is showing the devices are not connected. I have tried with programmer, and the port is also not visible   in device manager. i have tried with all the different cables. the code as no issues the program has also been build earlier. but now the issue is it is showing the devices are not connected when i try to dump the code. whenever  i tried to power it up the Leds of the board blink continuously  they  blink with higher frequency. Thank you in advance.

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