I’ve a Raspberry Pi 4 with a dual SATA HAT, and I’ve a 12V/5A DC jack 5.5x5.2 mm PSU. I think I’ve assembled the system correctly, but “nothing happens”. (I haven’t actually tested the PSU, but I’ve tested the rpi board, it boots from SD correctly.)
Could someone point me to the right direction on how to proceed in this situation?
Thank you for your help in advance!