head rank shouldn't matter, i've slammed heads in without updating the head rank and it prints just fine. Not that its recommended... as the rank is needed to "fine tune" your head, but shouldn't throw an error if not.
my guess is that you don't have your ribbon cables seated correctly. Top slot on slider board goes to left slot on the head, i've gotten errors for having these crossed before, as well. Power-down, pull the cables and re-seat them with extra care. A kink/pinch in the cable may also be the culprit.