It doesn't help if you've trying to do it totally blind, but the 2 open square holes go on top, once I figured that out I've never had any issues plugging them

It doesn't help if you've trying to do it totally blind, but the 2 open square holes go on top, once I figured that out I've never had any issues plugging them in correctly. The only one I have issues with is my keyboard because the pcb in the plug is black and the it's a little hard to tell which side is the open holes and which side is the black pcb.