I seemed to finally be getting things figured & straight and now the board is acting like a fuse or something was blown. I was in the process of reversing the Stepper direction of a couple of my axes and suddenly I tried plugging in my RAMBo board and I got no response from anything indicating the board on or had power (LCD won’t turn on, the LEDs indicating the board was receiving power didn’t come on and computer didn’t connect with the controller. I was so close to getting things prepared to test print and now this.
Very Odd. After initially rechecking the wiring and still not getting a response I switched controllers and on the other I was unable to get one of the motors to operate. Just wanting to check the original controller without anything attached. After supplying power to the controller the LCD lit up. I connected the other wires other than the endstops and it all worked again. I don’t know if it was wiring or what, and why it suddenly was unable to be powered.
Not sure it will help much but I’ll cross my fingers for you. 
This board seems to be putting you through the trouble shooting wringer.
Yes it is.