I wouldn't be too hard on yourself--It's remarkably bad hardware design that there is a "correct" port (or set of ports) on what appears to be a perfectly symme

I wouldn't be too hard on yourself--It's remarkably bad hardware design that there is a "correct" port (or set of ports) on what appears to be a perfectly symmetrical system (on the outside), but with no markings on the system to indicate _which_ is correct.