Okay, dumb question, I think. Should ALL of the LED’s go on when this is powered up and no modules are plugged into it ? Or, will only one LED light go on or two or ? (I do have the 5v parts connected too) I am just trying to see if I have put this thing together correctly. I am registering +12v on all of the bus connectors but only one of the LED’s stays lit up when it is plugged into the power supply.