Not so long ago my board stopped booting (BeagleBoard Black PCB RevB5 from Antminer D3).
After power-on only power LED is up. All USER LEDs is not lighting.
I tried boot from MicroSD card, hold S2, RESET, POWER, and other button (switch is not soldered on the PCB, see the photo) combination but it did not give me any results.
I connected the board (J1=1,4,5) through USB-to-TTL to my pc and saw the following information: